Chevrolet Performance 19331581 - ZZ572/620 Base Crate Engine

Sold as a long-block assembly with the cylinder heads, oil pan, damper, front cover and flexplate installed. Requires induction system, distributor and additional accessories. Engine ZZ572/620 Deluxe Horsepower 621HP @ 5400RPM Torque 645FT/LBS @ 4200RPM Compression Ratio 9.6:1 Block Cast Iron with 4-Bolt, 4.560" Bore Crankshaft Forged Steel Heads Aluminum rectangular port, 118cc Chambers Valves 2.250"/1.880" Camshaft Lift 0.632"/0.632" Hydraulic Roller Dur. @ 0.050" 254°/264° Proving the adage there’s no replacement for displacement, the ZZ572/620 is the ultimate expression of Chevrolet Performance’s engineering capability, wrapped up in a soul-stirring combination of performance and attitude. Chevrolet Performance builds the ZZ572/620 with huge 4.560-inch bores and a 4.375-inch stroke to help it deliver 621 hp and a stunning 645 lb.-ft. of grunt! Strength comes from a latest-generation tall-deck block casting with four-bolt main caps and an all-forged rotating assembly, while high-flow aluminum rectangular-port cylinder heads with massive 310cc intake passages, 1.88 inch raised exhaust ports and 118cc combustion chambers process tremendous airflow. A hydraulic roller camshaft with an impressive 0.632/0.632-inch lift and 254/264-degree duration specifications optimizes the airflow volume enabled by the large-port heads. INSTALLATION NOTES • Clutch linkage boss is now drilled and tapped. When using cast-iron exhaust manifolds, lower head bolts may need to be replaced with bolts with shorter heads, for clearance • Requires addition of starter and fuel pump (not included) • Gen VI tall-deck block has machined mechanical fuel pump boss • Comes with a 14" automatic transmission flexplate. Requires internally balanced flywheel for manual transmission applications • Not intended for marine applications