this is my combo. stock rods and crank, 162s, eddy rpm performers cut to 72cc, the block was cut so that 162s were .005 in the hole (iirc), 6pk for carbs, tti exh. rear wheel hp 325, trq 350. i found out later that the 162s were so unpopular. have had no problems with the pistons or the motor, been together going on 5 years now. at next rebuild i will stroke it.