I've searched but can't seem to find what I'm looking for. I downloaded a chart (from Andy F, I think) for a 470 build using a 400 block and 3.91 crank showing the different length rods (Big Block Chevy) and piston combo's but I don't know how to come up with those stats for a 400 block with a 4.15 stroke crank. I looked at 440 Source but they only list one - 500 cubes with a 6.760 rod and it uses a piston that requires oil ring supports and I don't want to do that. Was thinking a shorter rod - 6.535 or 6.385 may work but no idea about the piston possibilities....Any help or resource would be appreciated. Thank you....