427 bbc with 781 heads. 88 exhaust valves installed with good springs.

427 bbc with 781 heads The 396 swiftly led to what already existed in terms of displacement—the 427, which led to the 402 and 454 in 1970. 4 speed car weighing around 3550 with me in Hey Tom, as far as I know no large oval BBC prouduction head ever had larger valves than 2. 20 to 10. 050" with a flat tappet. mag2555 Guru 427 BBC by S&S Speed Center, AFD, Enderle MFI by Spud Miller Sepanek Racing T400, Dynamic converter, Autoweld, Santhuff, Smith Racecraft, Find big block chevy heads in All Categories in Canada. 5 dot hoosier at 3550 on a plate 250 went 6. 651 comp roller,2 inch hookers 750 vac, and msd ignition. Looking to be at 9. Untouched 781 - better. I dont think a roller is going to make that much differance in the ramp rates that it will cure this problem,I think BBC 781 open or 802 closed heads? Jump to Latest I have a nice set of 781 heads with big valves ready to go. Jump to Latest 427 pistons on 781 heads require a special dome. Hi Perf 396 427 468 496 70 336781 on 2040-parts. but i put the same motor in a 1/2ton truck . gonna run the ls6 nostalgia cam 540 lift with solid lifters. BBC PISTON RING SET. RPM intake, 1000 CFM pro systems car Your 781's will fit the bill just fine. 990's on a 427, even with a decent cam and 7000 rpms, dont suck all that good. . 049 had better exhaust port vs the 781. bbc intake manifold. Open-chamber designs are larger and provide lower compression ratios, so require a much larger piston dome to achieve the same compression as a closed-chamber head. 25 intake and 1. 88 exhaust Casting # Years CID Chamber HP/RPO/Comments 3904392 1967 427 Closed 430, 435 L-88/L-89, 106. Jump to Latest 6. Re: 781 BBC Heads Post by cpmotors » Mon Dec 04, 2023 3:59 pm vht wrote: ↑ Thu Nov 30, 2023 5:49 pm How much could you mill from these heads before you got into intake sealing problems? Closed-chamber cylinder heads have small combustion chamber volumes for high compression ratios, with even mildly domed pistons. 600 on good ports, 290 on bad 9. 7 rollers,7/16 push rods,Straub Tech custom Hyd. 00 /each. Just a rule of thumb. TH400 / 2500 stall. Nepean. 88 sized valve's I have a set of 781 heads for my 427 build and have been doing a lot of research on upgrades for them. BTW, they BLEW the "HI PERF" 990s away all over the place. Those heads are great. 75:1 combo. in Waco, TX. These 781-049 are good heads and flow well up to 6500 RPMs. 07 gear car as of 10-15-04 781 heads, stock size valves, bowl cleanup, minor port work. 858-16 which are preload adjusted 1/8 turn from zero lash any more will ruin them , which I found out by I got asked recently about the potential of the older 427 BBC and why would anyone bother, building a 427, when the larger displacement 454 and stroker versions like a 468, 489, 496 BBC can be built? a 427 built with the I'm running GM iron 781 large oval port truck heads on my 414 ci destroked 427 bbc. 72, mild bowl blend and smoothing around the guides. Luckily my builder has a set of virgin 781's if the ported ones don't work. I Cast iron BBC head vs. The pistons in the motor are Speed Pro L2349F which is also a closed chamber piston. Jump to Latest 21 - 27 of 27 Posts. brockrus (1,782) 98. I just did a swap on a 427 and went from a weiand dule plane intake and a set of 781's to a set of 308 iron eagles and a dart single plane intake. 88 exhaust valves installed with good springs. BBC 820 heads vs 049s or 781s. 3 angle valve job. Details. 7 Crane Cam Gold Roller Rockers) Cam-Straub BBC 288/300 @50 229/241 Lift 600/570 109 lobe sep. 750 cfm holley carb, 781 heads rebuilt stock, choosing the best cam for a BBC Check with Summit Racing to see if you can use your valve springs with this cam. 319 dome,MSD,Holley 850 vac sec. You can make a really nice set of heads for a lot less than a new set of alum heads. 00 dome ( could use an ICON piston with -28. 100"), or will standard length be okay? These are the specs of my setup: BBC 454 (+. Your 292 heads are openchambered oval port heads, which show to be 113 cc combustion chambers, but are probably larger. 42 MPH Long Motorsports Turbo 400 8" Convertor 6100 Stall 9x30 Hoosier Slick 15X8 Steel Buddy of mine is selling me these 781 BBC heads for $200. 25 bore), GM forged 396 crank (stroke 3. I debated as my 990s were the worst head I could have chosen. View all photos. 034" to . 20 to drop compression a little if needed ) Howard's GEN 6 roller cam 120326-10 Big Block Chevy Aluminum Bare Cylinder Head Pair BBC 427 454 502 123CC/336CC. 5:1 compression ratio, Edl. Downside is they don't while its true that the low rpm torque does tend to be reduced with stock oval port heads vs stock rectangular port heads ,its also true that the compression, intake manifold, cam timing,rear gearing and header designs all Cylinder Heads, 377cc Magnum BBC Competition Racing Heads, Aluminum, Assembled, 122cc Chamber, Chevrolet, Big Block, Pair. 81 or 2. If you 68 Camaro SS - 468 BBC, 781 heads, RPM Air Gap intake, Lakewood bellhousing, M21, BO coded 12 bolt - but 3. 019 Head Gasket or you 0-Deck and run a . on a 27x10. 19 valve and performance valve job will flow over 300cfm and that's 700hp 427 L88 BBC Solid Flat Tappet Camshaft 241 GM Iron oval port heads Pro Systems 1000 HP Victor Jr. 55 Tony Discussion starter. my pops is setting up a 454 with some 290 castings and stock lower end 4 bolt main. 655/ . Regarding power to money spent the 454 is hands down the winner. My cam is an Isky Z-33 . 400 stuff. Cylinder Head Fixture for Vertical / Surfacing Mills since 2008. Edl Air Gap,130GPH Holley mech fuel pump,ARP head/main studs,7/16 rod bolts,Tremec TKO600 5 speed with . 100 long and 427 BBC, +. I talked to a local big name engine builder tonight and he said the 781 heads were the way to go because the I have closed chamber pistons with 781 heads on a 396. $399. Find a set of 781 OVAL port heads that either already have a set of 2. M. Holley750 DP Edelbrock Air Gap intake Comp stainless pro magnum roller rockers JE/SRP pistons with -30. blend on both heads. 1 2 427 pistons on 781 heads require a special dome. Aftermarket BBC head. Air Flow Research | #1633001. The thing is, I don't know that I need 298cc heads on 433 cubic inches. 72 These heads make Great Power on BBCs . +25cc dome I got asked recently about the potential of the older 427 BBC and why would anyone bother, building a 427, when the larger displacement 454 and stroker versions like a 468, 489, 496 BBC can be built? a 427 built with the correct components is a damn impressive engine, Ive built more than my share , and if you do the research before you start throwing cash into Craig 70' ElCamino 414 BBC,781 heads stock valves bowl blend and port smooth,1. 11 Posi Block is standard bore 4. Jump to Latest have any comments on the flow/performance differences between the 820 open chamber oval heads compared to the 049 and 781 heads? Thinking the runners are approximately the same size. 5 to 9 cr 496 with a 120cc head, which is about perfect for a BBC I am using a set of factory 781 oval port heads. 5 + compression and the 290/063 heads (like i run) are basically the same lrg oval port head with 100. That begin said a 049 or 781 heads would probably be better choice for pump gas. I've never heard of a 071 casting BBC head. 63through the mufflers all motor full weight 3300lb 3. 67 Malibu Coupe, 439 BBC/Muncie M21, Holley Sniper 67 Malibu Convertible, 439 Edelbrock; 310/781-2222; Edelbrock. With a 496 to reach a 10:1 Static Compression with say the 113cc 820 heads you going to need a Piston with a 10cc dome, or approx a 15cc Dome with 781 casting, or choose say a 98cc Closed Chamber with a Flat top piston running a . These have higher airflow rates than production oval Two versions of the 427 debut in the Corvette lineup for 1966, with the "mild" hydraulic-cammed 10. 080",and then mill the 781 heads about . 781 GOOD HEAD. 1966 Big Block Chevy BBC 396 427 Oval Port Heads 3872702 C-7-6 C-30-6 702. Shop by category 454 427 496 336781 BBC Heads Corvette Camaro 781 Open Chamber 1973. 10 sec. 89@102mph 1/8 mile 6-24 L-29 461 BBC 11. They are worth rebuilding and respond well to pocket porting, Here is a link to big block chevy heads with casting numbers and cc data. A 496 has to breathe. They will measure bigger than 113 cc (more like 118-120) unless they have been previously milled. This engine has run a best of 10. GM alloy 074s fully prepped - WAY A 427 is a 402 with a larger bore. 7, and with those closed chambered heads,(in my opinion) is your comp. And with your 500ish horsepower goal in mind i hey guys so i have a 454. com BMP (world products) with pump gas,the larger OVAL port heads will generally produce better hp/tq than a 320cc rectangular port head on a 427 BBC, provided the compression ratio and cam and intake are carefully matched Instead, I found '73 049's. 477 posts · Joined 2003 Add to quote; Only show this user #1 · May 25, 2010. 65@125mph 406 with home ported Dart 215 heads. Buy It Now +$185. 050 Hyd. 41 1/8 6. brodix bbc heads. 25 i know that aint very fast but it was fun. Manufacturer Part Number. flat tappet part no. Reactions: magicrat56. cam and stock rocker arms. 5:1 comp. Large truck 366 and 427 tall deck engines 427 big block Chevy . These 049 BBC heads for sale are meticulously crafted to exceed OEM specifications, ensuring top-notch performance for your classic Chevy. 044" Range. 781 Heads $1200 12 Bolt 30 Spline axles $400 Braided lines Oil cooler $250 Holley 750 dbl Mechanical $500 12. I never took the time to measure them, but they were pretty small. 88, 12-bolt 3. I've built 8 or 10 454s and 3 of the 402 cu. I have had several BBC engines with 049 and 781 heads that ran really nice. 115 on exhaust & 427 big block Chevy , . 88 exhaust valves but they are open chamber heads. A salesman recommended AFR 274. The 049/781's are readily available, cheap to buy, open chambered and make Seems the "go to" heads for a street 454 are the 049/781 heads. 24502619)- an engine w/a lot larger bore diameter and a 4" stroke I have a set of 781 heads for my 427 build and have been doing a lot of research on upgrades for them. Nobody makes an aftermarket closed-chamber head. 90's in a 3600lb 78' Camaro 16years ago. 070 bore but can stick with the . BR 7™ LS7 Compatible Series Cylinder Heads/12° BR 3™ Series LS3 Compatible Series Cylinder Heads/15° BR 1 13™ Series LS Compatible Series Cylinder Heads/13. a great street engine. 8cc, 1. 375 and 425hp/396/427 cam that use's Shop Chevy 427 Cylinder Heads and get Free Shipping on orders over $175 at Speedway Motors, the Racing and Rodding Specialists. 31 posi now. Another 781 OP heads 2. Hydraulic cam, I don't remember the specks but has a good lope to it. 25:1 compression L-36 rated at 390, breathing through oval port head. That really narrowed We are always looking for new castings numbers. roller (Actual cubic inches 432) PRI 2024: Edelbrock’s Hot New Heads for Gen 3 HEMI, LS, BBC and Olds PRI 2024: Edelbrock’s New LSXR Race Blower Delivers “Smart” HP PRI 2024: Kooks Big-Block Chevy Cylinder Head Casting Numbers. Jump to Latest 22K views 57 replies 22 participants last post by 74 Nova Jul 23, 2023. this was on foot brake with th400. About this product. 13840 posts · Joined 2012 Add to quote; Only show this user #1 · Oct 11, 2017. 60 driving to and from track same distance (33 miles, very reliable) Tunnel ram with 2 600 holleys 781 heads rebuilt with 2. Share. 73 rear. Used - Good. Thanks, Patrick. 've been thinking about building a 427,they are classic. Had a 67 427 with a May date and it cut the value at least 50% . After all they are truck heads. Chevrolet. installed 219-188 valves and milled the heads Then got an old crower grind 274fdp 274-288 or at . But isnt that a bit big for my setup? Old School BBC 427 with new school 671HP - CorvetteForum - Chevrolet Corvette Forum Discussion C3 Tech/Performance - Old School BBC 427 with new school 671HP - I don't have all the Stock 781 heads have VERY short installed heights. 68 watchers. Currently, with shims & rotators removed, my heights are avg. BBC Spark Plug Reccomendations 781 heads. 30 s. 19 intake, 1. 46 which was driven with a roller 461 bbc. Get +. Hey guys I’m new to this engine building scene and would really like to get into it. Red 427 BBC AFD, Enderle MFI by Spud Miller T400, Dynamic converter, Autoweld, Santhuff, Smith Racecraft. Rect port Get the best deals for 781 Bbc Heads at eBay. 3 angle cut on the seats. 1%. Chevy The 427 revs to 7000 rpm and it hit 8000 a couple of times accidentally and sounded great. 9 Manleys and a Jomar. com. Etobicoke. There is a reason that all aftermarket BBC heads are open chamber design, they work rather well. 8:1 compression Voodoo 60203 cam Anyone considering these heads is probably running 427-496 CI and that were these things are great if properly prepared. Because all factory style 427 forged pistons and mentioned clones are designed for rect port heads. 7/1 steering box $200 BBC cylinder head 366 427 Chev for 702 heads w/ 98cc chambers yielding 10. 496hp-510tq all done at 5700 rpm. 4:1 CR), Lunati Voodoo billet 60213 hyd roller, Lunati hyd roller lifters Buddy has one in his Nova (similar BBC combo) and has run a best of 11. 00 stroke. Alot of Guys install bigger valves to 2. 781CASTING. -----Cable real nice Harleyoz i love 427 bbc . turned in the 10s with a 427 ci Motor. The first open chamber heads were aluminum and introduced on the revised L88 in 1969 and also used on the 1969 ZL1. it pulled hard the first 330 then slowing down. I guess you drive on from 10. Buy It Now +C $105. 1 with a Flat top Piston. chevell-65 . eBay Product ID (ePID) item 3 1966 Big Block Chevy BBC 396 427 Oval Port Cylinder Heads 3872702 Closed Chamber 1966 Big Block Chevy BBC 396 427 Oval Port Cylinder Heads This is for a Good Set Of GM BBC Bare Open Chamber Heads #336781 they still have the stock size valve Seat of 2. 72 ex 3919842 1968-69 396 375 L-89 427 Closed 430, 435 L-88/L-89, 106. 88 valves,9. Car is a street car, no strip action. 85cr o SOLD 6/2020 my 68 Vette 427/M-20/3. 3915 60' 10. Hobbies › Car Engines & Parts. 427 BBC, 215 heads, 2. 641 morel hydraulic lifters crane gold rockers ATI damper 063 heads, closed chamber, 2. 454 Build with 781 Heads, Camshaft Question . The 781 heads had been milled and measure 110 cc. Question is . 300 intake valve in it. 7cc dome (Aries Pistons are lighter) (use thin wall, lighter wrist Pins - with either piston) using a . Mentioned it will mainly need valve job and reseating on 2 valves. Our 049 Chevrolet cylinder heads are specifically designed for the 454ci V8 engine, delivering exceptional power and durability. 030 over bore, Mildly ported 781 cylinder heads 2. 540" or so lift solid lifter cam like CC's great old 282S Magnum. 781 heads completely rebuilt with new parts, bronze guides, large valves, This head was offered from 1968 to 1984 on all displacements except the 427. Porting in the intake runner and manifold only. Are these worth sending them out to a machine shop or should I look of other ones. Save Share Physically looking at both heads 781 vs 820 I don't see much different at all , I'm not a engine builder by any means , I like to play with my junk and try to ask questions and spend every night on the computer reading forum after forum and build after build doing Find many great new & used options and get the best deals for 454 427 496 336781 BBC Heads Corvette Camaro 781 Open Chamber at the best online prices at eBay! Free shipping for many products! I remember reading in a thread that the approximate wieght difference between a SBC and a BBC was in the nieghborhood of 175-185 pounds. AFR 3001 Big Block Chevy 335cc 781 bbc heads 454 396 402 427 . 3" will double the noise and attract police. Seems the "go to" heads for a street 454 are the 049/781 heads. This included quality 1 piece severe duty valves, titanium retainers, machined locks, ARP rocker studs, Comp guide plates, and somewhat cheap chrome-silicon street roller valve springs. Big Block Chevy Oval Port Cylinder Heads 781 Casting. You're correct in that open chambers flow better than closed chambers. 040, 781 heads with large valves, 10-1 CR, 60204 Voodoo cam, Performer RPM intake, 770 SA Holley carb, 3000 stall, 4. Can a set of 781 open chamber heads be installed on a 427/390 hp (L36) BBC shortblock that still has the original pistons? I understand that the clearance has to be checked Here's my details: it's a 427 block (Merlin 3, 9. 36 28 year owner o 68 Camaro Vert 327 project, just about done the last My 781's with a . With the 12. 2:1 600Hp Retro-SR 460ci MK IV, 288AR-10 Cam, Holley 830Dp 80511-1 Annular Booster /Air Gap. 1 to 1 on a decked 427 Cam is HFT 230@50 and . Message. Engine was a 427 at the time. 11echo Discussion starter. Top. 030' and have a nice 11. OEM GM 1968 Big Block Chevy 3917215 Large Oval Port Cylinder Heads 396 427 454. 36 28 year owner o 68 Camaro Vert 327 project, just about done the last 6-7 years, LOL. they have been checked for cracks have none. 20 minutes of ext. Rect port heads, open or closed chamber, are factory designed with more open area around the exhaust side of the Well for starters,I think the pistons are going to need to be fly cut to clear that cam especially on the exhaust side. . 19/1. 454 427 496 336781 BBC Heads Corvette Camaro 781 Open Chamber 1973. Buddy of mine is selling me these 781 BBC heads for $200. 8cc dish and I somehow bought a set of 781 heads. Condition. So-is there a HR cam and spring combo that would add a bunch of HP? If so, I am all ears!! Thank you! See less See more These 049 BBC heads for sale are meticulously crafted to exceed OEM specifications, ensuring top-notch performance for your classic Chevy. 72". With valves and springs $800 obo. 88 but NO PORTING. Look no further! We have the perfect solution for you with our 049 Cylinder Head. 00. With the specs listed below, will it be necessary to get valves with longer stems (e. 060 with . Summit Racing SUM-K03052 - Summit Racing Street & Strip® Cam Kits - Other than very high-end race heads, most big-block Chevy heads have chambers around 119 to 120cc, so the choice is more one of piston design for street/strip engines. The 298 heads flow quite a bit better since they're a full CNC head. what's wrong with good old AC R43T? Pro question poster. 07/1. 3931063 Chevy 395ci Cylinder Head Bare BBC 1969 . Red 1967 Chevelle SS 396, 4 speed, 3. g. I have the 240/246 in my bbc 454, I 85 corvette<br />best 1/4 numbers:<br />60ft 1. I've read that 9. Thanks for the advise guys. 12. Post by Bob Hollinshead » Thu Mar 10, 2016 3:25 am. Same block and heads now with a 4" crank (468 I agree with the above posted reply. It was a 10 to 1 motor. I am at the moment basing my build on the one CPmotorworks did a detailed thread on. I have sold 100s of these here on ebay,for over 25 There are differences in the BBC head’s intake port shape: rectangular and oval. Chevy 781 and 049 were the "big oval" heads and are kind of the go-to for good factory high performance street I have oval port heads on my 427 with a Z-33 Isky cam and Strip Dominator intake along with other parts that allow high rpm use and the engine really runs well and the 66 Chevelle Decent damn head for something that says " PASS" and not " HI PERF". Finish: Natural. Following and good luck with your build. 017 head gasket shims to get the compression closer to 9 to 1. For what it's worth the shipping wieght of a LS2/4L60E and all the engine accessories, A/C,PS,Alternator,etc weighs in about 75 pounds less than an iron head SBC motor alone. 35/2. 5 compression, tunnel ram and a flat tappet cam. These heads are very mildly built with 2. Part Number: AFR-2015-TI. 88 valves with some port work, 60212 Lunati Hyd Roller, 3310 Holley 750, Performer RPM intake, TH350 with shift kit, 049 or 781 Big Block Heads? Jump to Latest 8. the photo below has a 427" BB, 13:1, solid roller, 990 (iron) heads AND those particular gaskets "sandwiched" between the "non-O-ringed" cast iron block. The BBC engine has undergone a number of revisions since its inception, but the Mark IV design — first introduced in the 1963 Daytona 500 stock cars — has become the staple in the industry for big performance out of a workable package. 9 cc closed chambers before milling. 5:1, 6. Vortec 062's 406 w/hyd. Bob Hollinshead Guru Posts: 1505 Joined: Thu Feb 07, 2008 6:32 pm Location: Re: best spark plug choice for 468 bbc w 781 castings. Please Note: All . Early closed chamber heads from a 396/427 will give you even more compression. mcbabe Discussion starter. 5" exhaust if street/city cruiser. but if you simply re-ring and re-bearing a low compression truck, 427 bbc, slap those stock non-reworked 781 heads on the rebuilt short block and swap in a mild performance cam, you'll have a myriad of problems you may not be aware of, first the valve train geometry and clearances and valve spring load rates and rocker geometry, You made reffernece to your 290 heads with flat tops in a BBC as having approx 9. 564"-. 88 but they also run good as is. That design later found it's way into the iron castings in 1971. Some cheep off shore intake. Aftermarket improvements such as cylinder heads, camshaft and valvetrain design have only added to its A reg 427 block gets WAY too much Imho the 4. Anyhow my 049 had a decent bowl job with 2. o SOLD 6/2020 my 68 Vette 427/M-20/3. brockrus (1,790) 98%. Sponsored. Superior aftermarket oval-port heads are available from all major head suppliers in iron or aluminum. 1970 454 Cu in Replacement block, Rectangular port heads (not sure of year, haven't checked #s yet), Comp cam / Hyd roller, 750 Edelbrock. 25" s = 496" short deck BBC is about the most cost effective of them all. Find many great new & used options and get the best deals for 454 427 496 336781 BBC Heads Corvette Camaro 781 Open Chamber at the best online prices at eBay! Free shipping for many products! Speed-Pro developed powerforged pistons and set the pace in powerforged technology. Oval 1. 3273Lbs 454bbc 11,5:1 flatt solid 0,050 266/276 lift 600-620 lobcep 110 heads iron cloced chamber with 2,19 and 1,88valvs 995 Cfm demon The 73 454 MK IV came with either a 049 @ 122cc Vol Chamber or a 781 118cc Chamber. Add to Cart. in engines. 781 heads Carb 750 methanol 6500+/- rpm This will be drag race only, no street driving. 10@118mph 9-30-22 10. 06- and 1. 19's. 68 Camaro SS - 468 BBC, 781 heads, RPM Air Gap intake, Lakewood bellhousing, M21, BO coded 12 bolt - but 3. 00 delivery. 85 stuff with 2. 30 intake valves in the 298 heads, 2. 85 at 119. 5:1 figure target for an iron head BBC, pump gas build from a lot of you guys that build engines professionally. bbc New build BBC 468 made 550hp and 555lbs of torque. stock heads are 120-122 cc chamber I believe , with out looking it up? With some work these heads, can build power. These two c/n's are considered to be the same as far as performance and specs go. Cleaned magnafluxed and dipped to clean water jackets . 880 valves, pocket port job with a good valve job went 10. 100 long and required retainers and locks/shims. US $299. Visit Kijiji Classifieds to buy, sell, or trade almost anything! 427 , 454, 468 Will work on Aluminum cylinders heads, will not brinelling $120. 0L/427 Chevy big block Mark IV Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! $20 Off $250 / $40 Off $500 / $80 Off $1,000 - Use Promo Code: Look at some of the baddest bbc heads out there. In the Chicagoland area any given day on Craigslaist there are 2 or 3 complete 454s for $500 - 750. GOOD! ( liked my 049s better as cores, but their former marine use FUBARd up the passages too much) 340220 427 72-76 Truck Tall deck 345014 454 74-86 Truck 346236 454 74-76 2-bolt 359070 454 74-90 Truck 361959 454 73-85 Car & Truck 68 Camaro SS - 468 BBC, 781 heads, RPM Air Gap intake, Lakewood bellhousing, M21, BO coded 12 bolt - but 3. Staff member. Stock 781 heads have VERY short installed heights. I guess 8. Save Share Find many great new & used options and get the best deals for CHEVROLET BBC 454 427 496 336781 781 HEADS OEM PAIR CORVETTE CAMARO at the best online prices at eBay! Free shipping for many products! 427 bbc bored 30 over ARP studded 2 bolt main Steel crank, H-beam rods 781 oval ports, blasted cleaned and completly rebuilt It is filled with hard block and 781 heads with the small valves. 72-inch valves. 680 Comp roller,2. 242/254, . Pre-Owned. Big block chevy bbc 781 casting large oval port heads 396,402. on the 781's im gonna be working onif i can get the csa big enoughim gonna put a 2. It's a nice cam, but not in the super high performance range, and actually even works well with stock stall converters in automatic cars. 1. 88 exh It’s mainly a street car with a th400 and 3. Power glide and 3. I did have a clearance problem with the sides of the dome hitting the head. I have a chance to buy a set of freshly done casting #781 heads with 2. 0 to 9. but 330 time was same as in 11. 06:1 L88 pistons you can run about . 030 over bore bootlegger camshaft 240/255 duration @. 88 (flowed 300 cfm @ . 550 lift but that could change to match the head flow rate . The 781's are a 2nd Gen head design and have Hi-Nickel Hardened alloy around the Valve Seat area. same speed 125mph. Work the stock -781's or -049 heads over, add a 280/236, 110/106 about a . IK® Series Cylinder Heads/23° Race-Rite® Small Block Series/23° Dragon Slayer Series Heads - 206 (1. 73 Eaton posi, Scat forged rot assm (21cc Wiseco slugs for 10. Intake- Edelbrock Air Gap Headers- Hedman 68198 1-3/4" Primaries Carb- BIGS Stage 7 750 cfm Trans- 4 speed Gear- 4. very nice ready to run stock form 781 heads best pair I have seen in a while. 385 rods, 781 or 049 heads, dual plane intake and a vacuum carb. Bad. Plugs are R43XL. 2:1 compression (TRW L2239NF domed pistons), The 781 heads are the best cast iron large oval port heads GM ever produced for the big block Chevy engine. Save Share I am searching for the best piston and rod combo I can use on my stock stroke 427 BBC. 2K views 4 replies 4 participants last post by techinspector1 May 25, 2010. Plus you will need more pieces in the heads. The cast-iron Merlin series from World Products has been Find Brodix Cylinder Heads Race-Rite Oval Port Cylinder Heads for Big Block Chevy and get Free Shipping on Orders Over $109 at Summit Racing! Brodix Cylinder Heads Race-Rite oval port cylinder heads for big block Chevys bolt BBC DON. 781 heads w/2. Location: Amarillo, Texas, US. 19 in 1. Im throwing non egr cast intake free. The high silicon VMS-75 alloy is found exclusively in pistons powerforged by Speed-Pro. 2. 385 Rod The stock big block rocker ratio is 1. Look forward to your suggestions. 27 at 131. Except for the chamber cc 66 to 69 396 oval port heads with small 96 to 100cc chamber Gen 6 454 Vortec heads 100cc chambers Mill to as close as you can get to a 92cc finished chamber size for a 9. C $1,612. $400. 73 gears. 52 1/4 10. Jump to Latest I've posted it before, but I have right around $1400 invested in my 781 heads when done a couple years ago. 5. The 049/781's are readily available, cheap to buy, open chambered and make 3909802 oval port heads are closed chamber heads for '67-'68 396/427, 101 cc chambers. The car just made a number of passes at 134+ MPH, and not a single issue with those gaskets. 030+ over) about 12. 88 valves. 88 valves, a bowl blend and a gasket matchno other porting. The cam you've chosen is a really great choice, and I ran the same exact (Crane) cam in my 427 BBC with 781 heads and a flat top piston. 040" hgead gasket,you could fly cut the pistons about . You gotta get it in first before you get it out. 72 is the stock size These things were known back in the day of solid lifter 396, 427, 454 factory muscle engines of having a problem with dropping valves/breaking the heads off. They do need a valve job. 1990s, GM not only changed the name “Mark” to “Generation,” it also changed the engine. 5:1 cr on this motor. Block was bored, honed, line honed and decked. Cylinder Head Style: Assembled. Now I have seen them smaller though. BBC 781 Heads. Granted for PRI 2024: Edelbrock’s Hot New Heads for Gen 3 HEMI, LS, BBC and Olds PRI 2024: Edelbrock’s New LSXR Race Blower Delivers “Smart” HP PRI 2024: Kooks New Active Exhaust Systems For Modern Muscle Cars Yes early BBC Heads Prior to approx 69 are Closed Chamber with a Quench area behind the SparkPug noted as BathTub Chambers - Small CC = Hi Compression with small Dome and possibly 9. Pistons are coming and we can check piston to valve clearance. Balanced rotating assembly. If you have some information you want to share with us and our visitors, stop by the Forum and leave us a post! Right now we are limiting the listings to Chevy V-8 blocks, cranks and heads. 19 Valves at the best online prices at eBay! Free shipping for many products! 68 Camaro SS - 468 BBC, 781 heads, RPM Air Gap intake, Lakewood bellhousing, M21, BO coded 12 bolt - but 3. Located in Kingsport, Tennessee 37664. Old drag car, And yes I will agree that the 427 4 bolt main block that Bryon has could have I have a set of 781 heads that I will be getting modified for 2. 82 overdrive gear,Quick Performance I have a complete set of big block Chevy 781 casting large oval port heads. Milled down to 115cc Edelbrock Performer RPM Air-Gap Quickfuel 750 Dbl Pumper SpeedPro H693CP -22 CC pistons approx 9. , . All factory, high-performance engines featured the larger rectangular-port heads. it revved 5300 and no more. A 454 is a 427 with a 4. 8 deck height, ø4. Used on 396ci, 402ci, 366ci truck, 427ci truck, and 454ci Better than 781 heads. Opens in a new window or tab. If anyone is thinking of using a set of 781 BBC casting First bbc 427, 3904390 heads questions. Jump to Latest 454 + . 030 over; 9. 038" Composite gasket in order to keep the QUENCH a in a respectable . $200. The cast-iron Merlin series from World Products has been one of the most popular heads for retrofit service on all big-blocks up to and including 496-, Find many great new & used options and get the best deals for BBC 781 454 427 496 Heads Corvette Camaro 336781 Open Chamber 2. ” Finally, if you are looking for a closed-chamber head, you will need to use an OE cast-iron unit. 31 posts · Joined 2023 Add to quote; Only show this user #1 · Jan 25, 2023. very on prices , depends on condition. it runs Ive been pushing this Comp Nostalgia LS6 hyd. It's easy to get caught up in the numbers game Head Gaskets For BBC - Which To Use Help I may be changing the head gaskets on my BBC. 69 Z11 03D Van Nuys 82 Z28 Gordon Johncock's Pace Car 68 Camaro SS - 468 BBC, 781 heads, RPM Air Gap intake, Lakewood bellhousing, M21, BO coded 12 bolt - but 3. 427 tall deck bbc: Grumpy The Grumpy Grease Monkey mechanical engineer. Old drag car, back on the street. Old drag car, man i had a 427 in my ol chevelle will old L88 heads. 5293 @ 125. When I get some more money or sell my 990 and 781 heads,I plan to go to aluminum heads. 19"/1. looking at building and running a 427 with some 781's and 2. i later sold it to friend of mine and we installed-188`s, 0. Engine is a 10. Then have the heads. Whether you're rebuilding your engine or looking for an upgrade, these 049 big BBC Cylinder Head Casting Numbers RECTANGULAR PORT - Valve size 2. thousands of posts on BBC builds, 049 and 781 heads George Kettler o SOLD 8/2016 my beloved 1970 Elky 496. I was thinking of milling the heads some and maybe running . Brand New. 11 gears, street driven 1969 nova 427 1969 Camaro 350 1968 Camaro Convertable 350 John,781's are some od the best open chamber BBC heads out there. 030 cstraub hydraulic roller: 108 installed at 102. BBC 396/427 Chevelle/Corvette oval port closed chamber head, casting # 3872702, date A-21-6, repaired exhaust heat riser passage, shot blasted, SINGLE bare casting OEM 049/781 heads to a max of 5700 RPM - Clay Smith Cams 20+ years ago this cam took my 9-1 oval port 427 in my old 3600+ lb `73 Camaro into the mid 12's with ease, and that was with a pretty badly mis-matched combo (Strip Dominator intake, 850 Holley, junk B&M 2200 stall converter and 3. put a set of 820 heads on a 427, 11 and ahalf compression, 219, 188 exhaust, actually had to grind down in LS Compatible Heads Menu Toggle. Alloy seat in the exhaust, blended, rolled to floor. What do you guys do on the exhaust side? 454 big block bbc heads 781 horsepower. 26 shipping. Other big block parts $100. Flo-Tek 407-600 Assembled BBC cylinder Head, 360cc, Roller. 12-1. Several tall deck 366 and 427 have have taken apart have had really small valve in them. 1 to 1 on a decked 427-or-781 heads w 117cc chambers yielding 9. Darren 71 Chevelle 496ci CFM Ported Brodix Race-Rites 310cc, 394/275cfm, 10. 575" lift with a duration of 260 at . 84 ex I use Champion RV15YC4 Plugs with good results in my 781's fitted with 2. the awesome torque demolished my tci break away to small pieces. 31 12 bolt posi, black bench seat interior, Bolero Red - long term restoration project 68 Camaro SS - 468 BBC, 781 heads, RPM Air Gap intake, Lakewood bellhousing, M21, BO coded 12 bolt - but 3. if I go with stock 049 or 781 heads, I have a source where I can buy a set for about $300. Thinking of going to a hotter plug. Find CHEVROLET 7. 11/32" intake, 3/8" exhaust stems. 82 overdrive gear,Quick Performance Plus the small chamber shrouded the intake valve and hindered flow. 11-670-4 with magnum short stroke or travel flat hyd lifters part no. First bbc 427, 3904390 heads questions. $781. Your Name Your Email Your Phone Place Order. 25 in the 270's. 990s bad heads for a 427. Use the 781 heads but get a 454. 427,454 - Car Engines & Engine Parts - Kingsport, Tennessee | Facebook Marketplace I'm running a set of pro forge pistons with a 7. 587" lift ground on a 105LS solid lifter BBC 427 Build. 82/1. BIG BLOCK CHEVY HEAD BOLT SET. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Skip to main content. Install with a thin steel shim head gasket for max compression probably cheaper to just replace the flat top pistons to get compression. SO which is 336781 Head consideration for BBC . Old drag car, It did NOT correspond with the change in useage from 427 to 454. bbc tunnel ram. bbc heads 781. 050 242-252 and . what is the difference between XL and XLS plugs (ACDelco) in either R43 or R44 This head was offered from 1968 to 1984 on all displacements except the 427. Find or Sell any Parts for Your Vehicle in USA. Cam choice is up next. Both are getting the 2. 560 lift 290 duration and has good valve springs and mechanical lifters. 71. 75" valves. 75:1) Holley 770 Street Avenger Muncie M-21 3:73 rear Lunati 60204 Voodoo Cam Find BBC 454 781 Heads Complete Dyno Up to 625HP - HI PERF 396 427 468 496 70 336781 in Amarillo, Texas, US, for US $299. Can a set of 781 (or 049) open chamber heads be installed on a 427/390 hp BBC that still has the original pistons? What I have is a nice set of 781's with larger valves, pocket ported, and gasket matched. 75 @ 125 mph in a 3500lb Malibu. 336781 BBC heads, valves, springs, D15 74 and C20 74, standard valves, nice shape, $550 781 heads, Stainless valve 2. 17 watchers. 781 bbc, heads are open chamber oval port :tu depends on date code, used on 396-402-427-454. 781's with nothing more than a 2. Find BBC 454 781 Heads Complete Dyno Up to 625HP - HI PERF 396 427 468 496 70 336781 in Amarillo, Texas, US, for US $299. Up to 3,000 tons of force forges aluminum slugs into the basic piston form which creates a grain flow pattern in the structure providing excellent strength, ductility and improved heat dissipation. Roller,Speed pro +. Brand. 42 MPH Centerforce dual fric clutch, "781" heads 2. New (Other) $449. And MPG isn't any different. 5° Small Block Chevrolet Compatible Heads Menu Toggle. I want to chose a top shelf rod Crower, Carrilo etc. with the same cam I picked up 30HP and 40 ft pnds trq. 76), approx. 019" Mr 70' ElCamino 414 BBC,781 heads stock valves bowl blend and port smooth,1. That calculates out to just shy of 600HP at the flywheel. I plan on having a . 520 BBC 6. 12 minutes ago. These are bone stock heads great for stock or blank canvas choosing the best cam for a BBC What compression ratio do you have? If you don't know the compression ratio, what type of pistons do you have or part#? Has the block been bored and decked? Do you want to run a hydraulic or solid lifter cam? What kind of car or truck is the engine to be used in? Stock 781 heads, block not decked, forged flat-tops, stock 454 i had a set of 049 oval port heads, similar to the 781. Save. Jump to Latest 27K views 41 replies 11 participants last post by nad427 Feb 4, 2018. Couldn't really find much on stan weiss's site and mortec just listed the 781's with 118cc chamber, 256/114cc ports and the 049's with 122cc chamber, 255/119cc ports. 781`s or 290`s? (BBC heads) (open chamber oval port) and a good pair of 290`s which are closed chamber large oval port I am building a 427 with the L88 pistons in at zero deck and a . 42 gears). This is my combo. 06/1. 427 L88 BBC Solid Flat Tappet Camshaft 241 GM Iron oval port heads Pro Systems 1000 HP Victor Jr. Get your cam and components from a reputable builder. 25 454 Crank is forged Pistons are Forged Aluminum ZL2300F domes Find Bbc Heads in Cars & Vehicles | Find new or used cars in Canada : Honda, BMW, Toyota, Hyundai, Kia, Mazda, Nissan, Chevy, services, parts and make every mile enjoyable. Mar 21, 2018 #2 427 bbc, slap those stock non-reworked 781 heads on the rebuilt short block and swap in a mild performance cam, you'll have a myriad of problems you may not be aware of, first the valve train geometry and clearances and valve spring load rates and I was actually impressed with the traco builds and i got that 2268 piston and some 781 heads. Of course, compression will BBC (427 . I then will go to a 114 cumbustion chamber to achieve Could be wrong and it wont be the last time but thats what I have always found! 2-bolt would be a 3/8 plug over the filter and a 1/2 plug on the 4 bolt. 19 1. The exhaust side can use stock length valves with some sort of rotator eliminator (spacer). Material Type: Aluminum. As far as the 781 heads, they are a great factory oval cast iron head. My 300 Deluxe. 330864: ’68 through ’84 oval port, open chamber, 2. I wouldn't recommend the 840's for a street 454. I have a 461 BBC that came with a set of casting #215 heads that according to Mortec is a 101cc closed chamber head. 060 bore the eng presently has. I'd like to clear up a little misunderstanding, I thought I knew the answers to this but I'd appreciate a few answers to confirm. played with noids and on the same plate i got it to flow 345 and it went 5. If you have larger intake valves installed. 00 shipping. ratio issue with pump gas. 19-1. 4 posts • Page 1 of 1. 4 posts I am not sure when the peanut port head came out, but I would guess around the mid 80's. 88 bigger valve conversion. Product Identifiers. 31" b x 4. Outside of the peanut plug newer heads I have yet to see a block or heads for that matter that didnt say hi/perf passenger in the castings. Listed 12 minutes ago. I need help with valve spring height. TRW 6524's with a 25. Headers 1 3/4 will give good clearance. no port torque. from United States. It says "open" and it says "113cc"? Can't be both can it? Yes, but in real life many hundreds of people Read the 496 kit specs to determine the compression ratio that it will make with a certain cc head. M DandDMachine wrote:I have a couple jobs coming up with some 781 and 049 BBC heads. zffg phvun zasby xurr nvyz gnk xdokbbu wbqf gsycxxk vdn