Hmm... well now I'm confused as to why they were recommended. When I compare them to the 250 pistons
http://www.summitracing.com/parts/stl-w403p20/overview/make/chevrolet
it looks like the 307's would have higher compression since they are not dished.

Also, I do not want and will not put a 4200 in this vehicle. The idea is to update an old engine for fun and uniqueness. I'm already running an Atlas engine in another vehicle as well.

Last edited by Mitch; 05/08/14 07:38 PM.