Page 120 of GM Performance Parts 2006 Catalog by GM Parts Direct

CRATE ENGINES BIG-BLOCK WHATS HOT? R stands for RACE! Designed to RACE! Orange just looks fast! 12498827 ZZ572/720R Deluxe 118 GM Performance Parts does not utilize any used or remanufactured parts in this crate engine. GM Performance Parts crate engines include a twelve-month, 12,000-mile warranty. W ZZ572/720R DELUXE TECH SPECS: Part Number: 12498827 Engine type: Chevy big-block V-8 Displacement (cu in): 572 Bore x stroke (in): 4.560 x 4.375 Block (P/N 25534368): Cast iron with 4-bolt main caps Crankshaft (P/N 88961554): Forged steel Connecting rods (P/N 88962926): Forged steel, shot peened Pistons (P/N 88963227): Forged aluminum Camshaft type (P/N 88962216): Mechanical roller Camshaft lift (in): .714 intake .714 exhaust Camshaft duration (@.050 in): 266 intake 274 exhaust Cylinder heads (P/N 88961160): Aluminum rectangular port, 118 cc chambers Valve size (in): 2.25 intake 1.88 exhaust stainless steel Compression ratio: 12:1 Rocker arms (P/N 12361323): Aluminum roller style Rocker arm ratio: 1.7:1 Distributor (P/N 10093387): HEI Carburetor (P/N 88962217): 1090 cfm Water pump (P/N 14058915): Aluminum, short-style Spark plugs wires: Included Recommended fuel: 110 octane race gas Ignition timing: 36 total 5000 rpm Maximum rpm: 6750 The ultimate beast! When our GM Performance Parts engineers sat down and designed the ZZ572/720R, we told them to build something nasty. We think they accomplished that mission with a resounding 720 horsepower and 685 lb.-ft. of torque creating at the same time the most powerful big-block crate engine ever offered by GM Performance Parts. We took the ultra-popular ZZ572/620 pump gas street engine added 12:1 compression pistons, a hotter camshaft, and our rectangular-port aluminum Bowtie heads with stiffer valve springs to work with the new cam. The block is the Gen VI tall-deck Bowtie block which was designed for the 572" application. The solid roller camshaft is a .714" lift magic maker that aggressively feeds the air/fuel mixture into the hungry, high-squeeze, stroker big-block. The ZZ572/720R is rated at 720 horsepower at 6250 rpm and 685 lb.-ft. of gut-wrenching torque at 4500 rpm. The short block is built with a 4340 forged steel crankshaft, shot-peened forged steel rods, forged aluminum pistons with full-floating wrist pins, stiff dual valve springs, and a louvered oiling windage tray. Our Deluxe ZZ572/720R ships with a 1090-cfm Demon four-barrel carburetor, tall-deck single-plane intake manifold, HEI distributor, aluminum short-style water pump, and 8 mm spark plug wires. Distinctive 572 cast aluminum valve covers complete the package. All you need is a GM Performance Parts lightweight starter to fire it up!

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