255cfm SD ported head, 4.21 stroke forged crank, 224/236 @.050 just .530 lift,tighter lsa' full roller. built q-jet, 0 decked, custom pistons 9.2;1. tuned dist.. gasket ported stock intake, msd ignition. long branches. it's a driver and a conv.. it's pretty close the the pure poncho mule engine in the mag.