Thread: 67 Sj 327

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With the forged pistons, do I have to do any machining to them? I've heard they are stronger but have worse castings then cast pistons.

If you are going to use Vortec heads, then you don't want a dome piston because it will put you over 11:1 static compression, like the old '65 Corvettes. I would go with forged flat tops, and then choose as cam that will give you a DCR of between 7.75 and 8.0. That way, you will be able to run pump gas with no problems. When I had a 327 in my first street rod, I built it with Speed Pro pistons. I never noticed any quality issues--I think Speed Pros are the same as TRW. The only negative thing about them is they are heavier than the newer SRP, Wiseco, and other forged pistons. But on the positive side, it won't make much difference, if any, in a street performer, and the price is certainly better than other forged units.