Thread: Bbc id

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Trying to ID this BBC the casting number is 10069286 the vin # is 1GCGC34NOJE175737 Thanks

90-91 454 mark-4 4 bolt...

OK that block with these heads what can I expect 336781 don't know bore yet

73-85...oval...OPEN...454, 118cc chamber, 256/114cc ports, I`m assuming street oriented big block, easy 1 hr per cubic inch, with a boat load of torque. I`m also beating down craigslist.

them heads will not work on that block if its a mark 5 block less you want a leaker

I`m glad Pat caught that, because I didnot know, can you emphasis on this Pat...?

He said it is a Mark 4 block will it work??

We`re in suspense Charie....!

Heres some reading charlie...
http://www.chevyhiperformance.com/te...ons/index.html

http://www.gmclassicmusclecars.com/chevy-s.html Maybe this will help as well.

i had posted on thid but did not go thru ?? sorry i was not there for you mark 5 or 6 will not take a mark 4 head they will leak in the valley i do not care who said they will work .you can use the 5/6 heads on older mark 4 block 1965to1989 with some work on the deck water pass and the right head gaskets for the 5 or 6 engine

Nobody is disputing , just trying to understand why they don`t work together. I`m normally a small block person, just getting into the big block region.

the deck is not the same if its a mark 5 block 90to91 is a mark 5 the 781 heads are ONLY mark4 1965to1989 i have put four or five older mark 4 blocks with the gen or mark 5 or6 heads the older mark4 block is shy around the valley side of the older mark 4 block that can leak if you try the older mark 4 heads on the newer 5 or 6 block less the CNC bow tie race block

Thanks Pat thats the kinda info we need for the first time around.!

Originally Posted by 406Rich

Thanks Pat thats the kinda info we need for the first time around.!

you did get it first time around and if you did some diging around here you would of found what you were looking for