4.3L, bored .020 over, BRC pistons, Eagle H beam rods, balanced/blueprinted, 4 bolt mains, windage tray, ARP studs, Comp. Cams #422 hydraulic roller with 1.5 roller rockers, guide plates and hardened pushrods. New late model Vortec heads with 1.60 exhaust valve, ARP studs and late model Vortec...