The only thing not stock is the 2 1/2 TTI exhaust pipes and Dynomax mufflers.Tailpipes are muffler shop bent 2 1/4.My calculated compression was 8.84:1 but I could go up to 9.9:1 by the rules.My pistons were .045 in the hole with a .028 MP head gasket and a 70cc chamber on the 587 heads.Block was bored .030 and stress honed but not decked.Rotating assembly was balanced.I'm running 3.55's and had a 1.99 60 ft on Saturday morning.Hot lapped it and had a 2.01 just a few minutes later.