1977 thur 90 ? I have an engine Reads 473 478 bb chevy.

Would this engine be worth building for Hiperformce proposes ?

yes, optional engine is pickups and suburbans.

All big blocks are worth building. Many of those had "peanut port" heads and like 7:1 compression, still a solid foundation and a head and cam swap away from a real fun drive

Thanks Jim
it has flat tops with deep cut outs for the valve reliefs on the pistons.

i had thought that the 427 was gone and i was amased to find one ,but i guess their more common than i thought.

they were in lotsa trucks.

get your head casting # and look em up at mortec.com to find out if the heads are worth using. Newer ones are ok, I think, it's the 70's thru mid 80's that had the peanut port heads.

They put 454 PASS engines in one ton trucks (light duty trucks), and they put 366, 427, and finally 454 TRUCK block engines in 40 and 50 series (medium duty) trucks and busses. The truck block is a four bolt main, tall deck truck (three compression rings and an oil ring) that is 0.400" taller than the standard 9.800" PASS/HiPerf block.

A tall beck block is a great foundation for building a 632 cid or bigger motor, but is a waste of cast iron for anything smaller than 572 cid due to the extra weight and problems with the tall deck needing special parts. You can tell the difference by looking at the block in the salvage yard, determining how far below the deck the water pump is. If it is 1/2" down below the deck then it is a tall deck block; if it is level with where the head bolts on it is a standard height deck block.

The other caveat is the difference between Gen V and Gen VI blocks compared to the old Mark IV blocks used in muscle cars of the sixties and early seventies. There isn't a provision for a mechanical fuel pump and has only six bolts holding on the timing cover (which is plastic); and should you see the exposed rear of the block it will have a one piece rear main seal.


Larger Dave