Former USST 305 sbc bored .060 over, aluminum gold 1.5 roller rockers, vortec heads, edlebrock intake, eagle rotating assembly, isky hydraulic cam. good engine for street or sportsman classes. Produces 370+hp with a box stock Holley 500 2bbl. includes balancer. Need something a bit larger for 2bbl/crate late modelwill sell for 3000 minus distributor, carb, fuel pump and pullies. or trade for 602, 603(ZZ4), 604, 2bbl machine motor, or a good shortblock.