GM Performance largest most powerful street engine is here. These ZZ572 are built around an all-new generation VI one piece main seal tall deck 572 cid with approximately 9.6:1 compression, 620 hp at 5,500 rpm, and 650 ft./lbs. of torque at 4,500 rpm with a recommended max rpm of 6,000. These all-new race blocks have a 4.560 in. bore and are filled with forged 4340 steel cranks with 4.375 in. stroke, shot peened forged 4340 H-beam rods, and forged aluminum pistons with full floating wrist pins. Redesigned rectangular port aluminum cylinder heads with 118cc combustion chambers, Stainless steel valves at, 2.25 in. intake side and 1.88 in. exhaust side. Hydraulic roller camshafts are used with valve lift being .632 in. intake, and .632 in. exhaust side, duration at .050 in. for intake is 254 degrees and 264 degrees exhaust side. Hardened chromoly retainers are used with dual valve springs 1.50 in. coil diameter, 1.800 in. installed height with 197 lbs seat pressure. Aluminum roller rockers with 1.7:1 ratios, high performance one-piece push rods are installed. New GM Performance Parts tall deck single plane intake manifold and 850 cfm Demon carburetors deliver the air. A GM distributor handles ignition, spark plugs and wire are included. New screened and louvered windage trays, High-rpm torsional dampers are used. Pump gas friendly, massive torque and horsepower, all from GM Performance.
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