Planning a .030 over 340 with 4.00 crank, closed chamber eddys , 550ish solid and was wondering about piston choices Domed vs Flat top? Off the shelf pistons like a Diamond 10.7 vs. a Ross 12.5 Would there much of a power loss from compression ratio vs the advantages of a flat top?

Did you mean dished or flat top?

Flattops

KB offers off the shelf stroker pistons for small blocks, either flat top or dished.

What are you doing with the engine... street, strip what?

Dan,

PM me or shoot me an email. I may be able to help your cause.
I could not PM you.

Thanks

Todd


compwedgeracing@aol.com

Strictly race, 3000 lb Dart,currenly running Ross 12.5 with a 360 block, same heads, same cam. Just wondering aboutusing Flat top in new short block. 65 cc heads

I'm in the process of building a street/strip 408, the pistons are Diamond with a 20cc dish. with my 55cc heads the compression ratio is going to be 10.97-1, with flat tops it would've been 13.27-1.

If I calculated it correctly, flat tops with 5cc valve reliefs would yield about 11.8-1 in you're motor.

I think I would try getting the compresion up useing a zero decked flat top piston a .035 cometic that fits YOUR bore, then mill the head to get your desired compression. High compression is not hard to get with a 400+ inch flat top piston small block. Doing you motor this way will get you the good flame travel from a flat top piston, genourous quench helps build tq and compression will help all around. If you do your motor this way you can use higher compression than a dome motor with no quench, also you will need less timing witch alows the burning fuel to push during the power stroke instead of the compression stroke, this will also allow more compression on a given octane

Thanks so much, That was my thought also but I needed to hear it from someone else.