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What's the casting number on the heads? It's cast into the heads, under the valve covers, between the valves. You really need to know the static compression ratio before you can intelligently choose...

I'd buy these NKB heads before I'd buy the Summit heads. 645 bucks for the pair, assembled. Add guide plates and you're golden. A well-built 383/388 should make 475 horsepower with them easily. ...

HaHaHaHa, yes you do Pat, a lot bigger.....speed costs money, how fast do you want to go?

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Begin with a 454.


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