Quote: If the pistons are .030 out of the hole I think your compression might be higher than you calculated. I think a 70 340 piston was .018 out of the hole and compression is rated over 10 to 1. How big are the relief's in those pistons? Heads might be 72cc
i'm not an engine wizzard by any means but this is what i was thinking half way throuh your post.
That is correct but the actual compression of a stock 340 is lower the 10:1.
