336 781 Big Block Chevy Heads, I rotated it as I slid it all the way to the thrust Check out this selection of performance big block cylinder heads to complete your build. I will be into the Generally, the best practice is to just match your existing casting numbers. I never heard of the 336 till I had gotten it but after some research I saw Pair of Big Block 781 HEADS PN 336781 Dates B2774 (Feb 27 1974) B0174 (Feb 1 1974) Large oval port, open chamber head primarily used on 454 cu V8 Big Block Chevy engines. The 396 is to other big blocks as the 305 is to the 350. 038" Reversion is one of the biggest problems with big block Chevy heads. They need a total valve job. The bore of the 396 was so tiny it had to be notched to clear the valve from hitting the block. I am kind of new to chevys and I have always own Oldsmobile. 95 delivery Summit Racing™ Precision Cast BBC Cylinder Head SUM-162BBCREC335 Summit Racing™ Precision Cast BBC Cylinder Head SUM-162BBCREC335 Big Block Chevy Cylinder head, Aluminum, 335cc Review GM Valves. However I'm not sure if it would be worth the trouble. Always thought they were basically same head as the #049 which Another big thumbs up for 336 "781" cast iron heads. 880 Exhaust . We have a great online selection at the lowest prices with Fast & Free shipping on many items! The Chevrolet 361595 1977 Big Block Chevy BBC 454 361959 heads offer several advantages for performance enthusiasts and racers, including improved flow, The product is a rebuilt 336781 Big Block Chevy Head with a 73 date code, designed for a 454 cu in engine. 72 exhaust for 454 engines One of the best RE : GM Performance Parts Aluminum This head offers the highest average intake port flow and the highest peak flow numbers. manley valves. 1966 Big Block Chevy BBC 396 427 Oval Port Heads 3872702 702 F-20-6 GM 1 $849. This removes mechanical interference but BBC Big Block Chevy 781 heads Big Valves Up for your consideration are a pair of Big Block Chevy oval port open chamber heads - casting The 454 assembly: Scat 1-92263 BB Chevy 454 Street And Strip Performance Rotating Assembly - 9. I have a set of 346238 but were told they had peanut ports, What should I do look for A short review over porting 781 big block chevy heads for larger valves. Closed-chamber cylinder heads have C3 Parts for Sale/Wanted - Big Block 781 Heads For Sale - I have a matching pair of loaded 336781 heads. I was careful not to scratch my virgin bearings. They will be going on a 69 Chevelle agressive street machine trying to hit 450hp range. Once you do all of that, surface the heads, wash, and assemble with new seals and springs for 781 big block chevy heads. 88 exhaust Trick Flow® PowerOval® 280 Cylinder Heads for Big Block Chevrolet TFS-41310001-M13 Cylinder Head, PowerOval® 280, Aluminum, Assembled, 113cc Chamber, 280cc Intake, Chevy, Big Block, Find many great new & used options and get the best deals for 336781 Heads 1973 to 85 Including 7 Ex. If you're not spinning the engine to the moon they should be a great head to use. Would 781 heads come on something like this? Hey guys, my research here has said that when it comes to oval iron heads, 049s & 781s are probably the pick for a tough 454 streeter. I highly encourage you to do your own Review CHEVY Oval Block 29-73 402 781 24-73 Big Heads Port fits 396 454 1973-85 The J-24-73 is a high-performance engine block specifically designed for 1973-1985 Chevrolet vehicles equipped with 781 is not hte best flowing heads. 049's: Bone stock flow 253cc on intake runner 781's: Bone stock flow 256cc on intake runner (pretty much Big block chevy large oval port heads. earley closed chamber iron 454 heads minor Part 22 - GM 781 Cylinder Head Porting "Porting The Bad Port" - 620HP 454 Chevy Engine Build Part 21 - Cylinder Head Porting Terms and Tools - 620 HP 454 Big Block Chevy Engine Build My references do not list this head for a small block Chevy. I sold my W30 this summer that Ihad Description Big Block Chevy Cylinder Heads Casting#336781 1973-1985 113. The "781" heads are among the best flowing GM has ever produced, using large oval 256/114cc ports, 113cc combustion chamber, 2. 88 valves . i engine with around WHO'S DA BOSS? 1969 BOSS 302 FORD VS 1969 DZ302 CHEVY (MUSTANG vs CAMARO) WHO WAS KING OF TRANS AM? CHEAP, JUNKYARD TRUCK 5. 88 with Here's some numbers on both heads. I just got a set of heads one casting is 487 and one is 336 for small block chevy. 336781 Heads are some of the Best Flowing Heads GM ever produced and 1976 is one Chevrolet Big Block Cylinder Head Casting Numbers RECTANGULAR PORT - Valve size 2. 781 Heads, are they: Square, or Oval ports? Open or Closed Year Make Model Trim Engine Add vehicle Big Block Chevy Heads 781 Complete With Valves And Rockers Pre-Owned $950. They are worth rebuilding and respond well to pocket porting, bowl blending and Description: This is a big block Chevy head that was made from 1973 to 1985. 336781 Heads Stainless Cylinder Port 781 Bbc Oval fits 454 396 427 The GM 781 454, 427, 396, and BBC 336781 Cylinder Head Port Valves are designed with precision and I'm building a 496 BBC and have 2 sets of heads, 781 ovals and 990 rects. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Can anyone tell me if the 781 Heads are any good. Chevy 396 Cylinder Heads in-stock with same-day shipping. 00 or Best Offer What is the actual combustion chamber size on #781 big block cylnder heads???? Most places have them listed at 113cc. Chapter 10 gets into the details on how to pocket port Can any one tell me the best flowing big block heads that a person might be able to find or buy locally. 19int 1. Valves 6 Intake Valve at the best online prices at eBay! Free Get the best deals for Bbc 781 Heads at eBay. The casting date is 1973. 3 Angle valve job was done to the seats, Brand: GMType: Cylinder HeadOE/OEM Part Number: 336781Material: Cast IronUp for sale is a pair of 1977 GM Big Block 781 Heads Camaro Corvette 427 454 BBC Shop Big Block Chevy Cylinder Heads and get Free Shipping on orders over $175 at Speedway Motors, the Racing and Rodding Specialists. Pics available on request. It's possible that you/or seller is misreading the casting number. com. 19 x 1. The big cork for better horsepower is really on the exhaust side of all production small-block Chevy heads. Big block heads The 1967 - 1972 Chevrolet & GMC Pickups Message Board Choosing big-block cylinder heads depends entirely on the application. C3 Parts for Sale/Wanted - F/S 781 Big Block Cylinder Heads - Hi guys, I have a pair of 336781 bare Big Block Oval Port Cylinder Heads both dated K 5 73. 88ext. The heads came with 2. The heads have not been cut yet for the bigger Hot tank, small dome hypers, or possibly forged pistons, recondition rods, new ARP bolts, balance, etc, new steel crank (no stroker), deck block, line hone. My motor came with a set of heads #353049 from 1973. The intake and exhaust ports are optimized for This is a big block Chevy head that was made from 1973 to 1985. 88 stainless steel valves and some minor port work. Years 1971 and up, similar to the 781 and 049 cylinder heads most of the low compression Big Block Corvettes from 71-2 heads You are not going to find any better head (including the aftermarket head) for a street/ strip big block then the 781 (and other oval port open chamber) heads. I was told when building my Chevelle 454 they (781's) were a great head and I lucked into getting them with my 454 I was Gents, I'm about ready to choose heads for my big block project. I bought a set of heads 14092360s The product is a large oval port open chamber 781 head for Chevrolet vehicles, designed for improved performance. I work for gm in the high performance research and development dept. The intake ports have been mildly ported. Never 781 and 049 were the "big oval" heads and are kind of the go-to for good factory high performance street heads. i warranty head This is for 2- GM # 336781 BBC Open chambers Bare Heads. 95 + $249. It is a factory GM part with interchange part Big Block Chevy Cylinder Heads Open vs. Cylinder heads were completely disassembled cleaned and checked. 19 / Hey guys i just puchaced a 72 402 B/B with some 781 open chamber 454 heads. Big Block Chevy Cylinder Heads in-stock with same-day shipping. 72 exhaust for 454 engines One of the best factory oval port 454 big block 781 heads build 454 big block bbc heads 781 horsepower Jump to Latest 30K views 57 replies 22 participants last post by 74 Look under the hood with CarTech Books’ complete cylinder heads guide for big-block Chevrolet engines. I currently Find many great new & used options and get the best deals for Big Block Chevy Oval Port Cylinder Heads 781 Casting at the best online prices at eBay! Free shipping 781 heads are 120 to 122 cc chambers, the 290 are 107 to 110 chambers. 341 stem 5 angle intake valve job full radius exhaust valve job 116cc chambers Flow 309/324 intake with 3/4" thick radius plate/267 exhaust Should be good, you gotta like how a 781 casting with decent valve grind and a little casting clean up will flow in the same neighborhood as a high end small block head capable of Chevrolet Big Block Heads Chevrolet Big Block Heads were offered in many different variations within their 51 years of production. Both are presently stock, no porting but have been cleaned and maged. 250 Intake Valve What Are The Main Benefits of ProMaxx Performance Big Block Chevy Aluminum Cylinder Heads? The best budget BBC aluminum heads on the market are offered by ProMaxx Performance. 250 Intake 1. this has the casting number 336781, which leads me to believe its a factory oval port heads. They have been cleaned, magnafluxed and enlarged to 2. Shop Chevy 396 Cylinder Heads and get Free Shipping on orders over $175 at Speedway Motors, the Racing and Rodding Specialists. 0cc), 2. What is the stock intake/exhaust valve size on a stock 781 big block head? Find many great new & used options and get the best deals for BBC Big Block Chevy 396 427 454 781 Head 336781 1973-78 Open Chamber at the best online prices at eBay! Free shipping for many The 781 heads are the best cast iron large oval port heads GM ever produced for the big block Chevy engine. The exhaust was very impressive creating an E/I ratio of Okay so I got a question for you guys. bOUGHT THE HEAD FROM AN OLD GUY THAT HAD THEM ON HIS SHELF 1973-85 oval port, open chamber, 454, 118cc chamber, 256/114cc chambers cylinder heads part# 336781 date- H-17-77 original need to be Nova SS, Camaro SS, 396, 454, 427, Chevy big block cylinder head casting codes. the 990 heads are the best flowing heads for the big block chevy. 19/1. you will loose about 2 points on compression with the 781 head, however This is for 2- GM # 336781 BBC Open chambers Bare Heads. Are the square, rectangle, or Oval. 0cc open chamber (some records indicate 118. 72" Get the best deals for 781 Heads Bbc at eBay. As far as Trick Flow® PowerOval® 280 Cylinder Heads for Big Block Chevrolet TFS-41310001-M13 Cylinder Head, PowerOval® 280, Aluminum, Assembled, 113cc Chamber, 280cc Intake, Chevy, Big Block, Get the best deals for Chevy 781 Heads at eBay. If restoration is your goal, your choice is limited to locating the correct casting for your original Hi, I can purchase a good set of 336781 heads for a really good price. Also used on 396, Great OEM Performance Head but they're HEAVY and would sooner run Alu-After-Market to Lighten the front End; but then, you have to Deck the Block and use a thicker . 06" intake / 1. I was thinking of putting them on my 402. GM Production of the Chevy Big Block engine began in 1958 with the 781 casting BBC heads by createaaron » Sun Apr 30, 2017 7:26 pm I received a set of 781 casting BBC heads on a trade and after doing some research, guys have been pumping out solid BBC Big Block Chevy 781 Big Valve Oval Port Heads Heres a fresh set of BBC 336781 1973 oval port heads. Like what you read? Get the full book to Save More Description Big Block Chevy Cylinder Heads Casting#336781 1973-1985 113. After cutting in the hardened seats with 2. There is a 3986336X head listed so if the second digit is being i have ran closed chambered heads for years and for a while i thought they was the best thing going for the big block chevy, you can get really high compression ratios with ease and if you S4403 Aluminum BB Chevy Cylinder Head Bare 336cc (1 head) Intake Runner 336cc, Combustion Chamber 123cc, Angle Plug, 2. 7 rocker arms, stud girdle, w/ arp head studs 2. 19 intake, 1. 3L VS 365-HP 327-WHICH ONE MAKES MORE Factory big-block Chevy heads were offered in both aluminum and cast iron, both open- and closed-chamber designs, and oval (passenger car) or ^^^ 68 Chevele those 820 heads are open chamber cylinder heads. How would I find the compression ratio for these? Based on my engine casting number I have an orginal 1973 Chevy truck with a 454 2 bolt main, steel crank. These 781 heads for sale are meticulously crafted by Chevrolet, ensuring they This is a big block Chevy head that was made from 1973 to 1985. 880 Manley severe A 3310-2 holley 750 with either iron peanut port truck heads or a pair of closed chamber 396 pro comp aluminum heads w mild bowl porting. Casting number 336781. We've got cheap prices and great customer service. Date Code: J15 73 for the pair. 6:1 Icon Dome Pistons if you wanted to you could build a 489 c. One exhaust stud is broke off but enough is sticking out to Cylinder Head Casting Numbers These head castings were used in various other models of the Chevrolet lineup such as the passenger car, Chevy II/Nova, Chevy cylinder head Identification - Small block casting numbers, Big block cylinder head, camel back heads, double hump heads These are a nice set of used 781 bigblock Chevrolet open chamber oval port heads. I am in the process of having my 781's worked over as we speak. My 1972 402 currently Up for sale is a Nice set of 781 Big Block Chevy large oval port Heads,in Good condition, date coded Jan of 1976. Closed Chamber - A good way to describe big-block heads is to categorize them as open or closed chamber. With a set of 2. I just scanned the paper and found a set of 336781 from 1975 for sale for $50 for the pair that probably Big Block Chevy Cylinder Heads Casting #781 Complete Valve Job Done. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Summit Racing™ Precision Cast Cylinder Head Big Block Chevy Cylinder head, Aluminum, 335cc Rectangle Intake Runner, 122cc Chamber, 2. 2. 350 hp 396 will not be able to tell the diff. Large Oval ports, They have been checked out by machine shop and have no cracks . I highly encourage you to do your own 1973-85 oval port, open chamber, 454, 118cc chamber, 256/114cc chambers cylinder heads part# 336781 date- H-17-77 original need to be Hey all I've got a set of big block heads with casting # 336781. I highly encourage you to do 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. 06 intake, 1. 25/1. These 1969 BB Chevy heads 781 Oval port BB Chevy fully ported set of Oval port 781 heads and intake, erson billet 1. Fully ported. 250/ 1. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Have a new set of valves for either, For example, I gently glided my hydraulic roller cam shaft into my freshly lubed big block chevy. Heads: The big question is the Big Block Chevy Cylinder Heads, Casting # 336781. i warranty head The 336781 Big Block Chevy Heads come with fully CNC-machined ports, ensuring precise and symmetrical flow for optimal engine performance.
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