Nib diamond 2v dished pistons
So if I read this correctly, these are .020 over and have a compression ratio of about 11.25+ to 1 with P.I heads, (42cc) and almost 12.0 to 1 with 38cc 2v heads. Are these clearanced for high lift cams with valve reliefs?
These are +.02" on the bore, have PI 2V reliefs, -11.5cc dish, 9.9:1 with 45cc heads. Using a .03" gasket, I get 10.5:1 with a 42cc head, and the piston .012" in the hole. If you square deck the block, the compression will come up slightly.
Really?
Sorry I sold the last set I had.
Maybe I've missed something but what's up with the "Really" comment Stanger00?
Really. last post was a few months ago so i thought it was worth a shot and i wanted to know the actual diameter of the piston itself.
thanks for your concern.
It was in the OP that has since been edited. The diameter was listed multiple times in this thread, lol. They were .02“ larger. That was what the 'really', really was for not if they were still for sale.
20 over does not tell me what the clearance will be for my particular block which is 3.574 bore. the diameter of the piston is not going to be 3.552, 3.572, 3.582 ect, that is the bore the piston is made for. the piston will be undersize to be able to fit in the bore example: 3.568 diameter piston for a 3.572 bore. if it was the same size as the bore you would instantly weld your pistons to the walls on first start-up. so thats how that works.
I know how it works. So you wanted more than what the package said and have the OP use his labor to mic each piston.
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