Thread: intake manifold for 70 heads on 1990 454

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old heads new block the intake bolts patterns are the same so a o port can be put on rec ports and rec port on o port heads . i would not do it but it has been done with a the right intake gasket and yes i will be 43 you young pup

sorry i'm a small block guy.
i just came across this 90 454 and these 70 heads and thought can i make it work? iv'e done small block ls1-lt1 carb conversions and that went well so why not a big block..
the block is a mark 5 one piece r-main seal
the heads are out getting cleaned up by a buddy and i'll post the casting # when they get back.the ports and valves are huge compared to other big block heads iv'e seen . this guy told me they were race heads. i would like to know where they came from. is there some place i can get that info with the casting #..thanks again guys . this site is sweet