When you’re ready to really step it up, it’s time for the GM Performance Parts ZZ572 and its massive 620 horsepower and 650 lb.-ft. of torque! This is flat-out, the baddest street Rat available that still happily runs on pump gas. The ZZ572/620 features 572 cubic inches of pure big-block and ships to your door in the coolest collection of orange, chrome, and aluminum you’ve ever seen.

There are several custom-designed components that make the ZZ572/620 the king of the street. It has a strong, 4-bolt block that was created with a 4.560" bore just for the 572" displacement. The 572 block is fortified with a forged crank, forged rods, forged pistons—everything was designed to offer you the ultimate big-block experience. To feed all of those hungry cubes, we topped it off with a single-plane intake manifold that has been port-matched to the rectangular-port aluminum heads. A custom, hydraulic roller camshaft uses .632-inches of valve lift to lead the charge. We make no apologies if the loping, aggressive idle of this camshaft attracts attention.

The Deluxe ZZ572/620 comes complete from oil pan (with windage tray) to carburetor, including an 850-cfm Holley four-barrel, HEI distributor, red spark plug wires, aluminum short-style water pump, and automatic transmission flexplate. It’s the ideal combination of big-block parts - designed, validated to GMPP standards, and tested in real world applications.

ZZ572/620 Deluxe Tech Specs:
Part Number: 12498793
Engine Type: Chevy big-block V8
Displacement (cu in): 572
Bore x stroke (in): 4.560 x 4.375br> 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 88962925): Forged aluminum
Camshaft type (P/N 88961557): Hydraulic roller
Camshaft lift (in): .632 intake/.632 exhaust
Camshaft duration (@ .050 in): 254° intake/264° exhaust
Cylinder heads (P/N 12499255): Aluminum rectangular port, 118cc chambers
Valve size (in): 2.25 intake/1.88 exhaust; stainless steel
Compression ratio: 9.6:1
Rocker arms (P/N 12361323): Aluminum roller style
Rock arm ratio: 1.7:1
Distributor (P/N 88961867): HEI
Carburetor (P/N 19170095): 850 cfm
Water Pump (P/N 14058915): Aluminum; short-style
Spark plugs & wires: Included
Flexplate (P/N 12561217): 14"
Recommended fuel: 92 octane
Maximum recommended rpm: 6000br> Balanced: Internal


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