390 hp. Magnum Crate engine. Thermo-block is bored .020 over. Magnum R/T Big Valve cylinder heads. Mopar cast Al. valve covers. High strength SS Valves, 2.02" Int., 1.62" Ex. Heavy duty valve springs. Hydraulic Roller Camshaft- 230'/234' Duration @ .050"/0.513" lift. pistons 9:1 C.R. Double...