[Classic v6 GMC's]

Originally Posted by TJ's Chevy

All those pistons are .030 over just to be clear. Few of them have different compression distances. https://www.summitracing.com/parts/u...make/chevrolet

I'd just go with these.

Thanks for the reply!
Yes I was just looking at .030 over because that is a common over bore. I'm going to wait for the machinist to tell me what size is needed.
I saw the different compression distances and dish sizes and that is why I wanted suggestions.
Any reasons for those pistons over the other? Just wondering.

I am building this for my 4x4 so I want to keep the low end torque.
How much would 1.84 or 1.94 intake and 1.6 exhaust valves help?
What about lump ports?
I plan on going with a 4 barrel intake.