GM 4L60E AUTO 4-SPD

This ATK Engines T7263AA (HPLH6N) is a limited production 5.3L LS (GM LH6/LC9) all-aluminum engine, generating 475 hp and 435 ft-lb torque. It features extra-thick cylinder sleeves, flat-top hypereutectic aluminum pistons, and powdered metal connecting rods. A performance-upgraded camshaft with .610 intake / .617 exhaust valve lift and upgraded valve springs is included. This non-DOD/AFM engine comes with valve covers and a timing cover, but does not include an oil pan or oil pump. Dyno figures are based on a 750CFM carburetor, Vic Jr. intake manifold, and 1 7/8 headers, with power potentially varying with EFI.