Cummins Engine Swap Kits

CMW Trucks - 1947 - 1972 Chevy Truck Parts


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ZZ572/620 Base Engine

The ZZ572/620 long block Includes all the features of the Deluxe, fully-dressed version, minus the water pump, arburetor, intake manifold, distributor and spark plug wires. Order all the parts to complete the engine from your GMPP dealer or finish with your custom parts.

The 620 features rectangular port aluminum cylinder heads that deliver 9.6:1 compression ratios in a pump-gas friendly package. A hydraulic roller cam with 0.632" lift drives the stainless steel valves. Chromemoly retainers, roller rocker arms and dual valve springs help make the valvetrain virtually bullet-proof.

NOTE: Intended for pre-1977 street vehicles and all off-road vehicles. Not intended for marine use.

Possible Applications

  • The ultimate hot rod starting point
    Pump gas drag racing—just add spray
  • Wake up the neighborhood—anytime!
  • Only install if you want to be the biggest dog on the porch

*Applications have not been validated. They are merely suggestions of how you might enjoy your GM Performance Parts crate engine. Some applications may affect engine warranty. See specific warranty information. Some applications may not be emission legal; check state and local ordinances.

Part Number: 12498792
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 88962925): Forged aluminum
Camshaft type (P/N 88961557): Hydraulic roller
Camshaft lift (in): .632 intake / .632 exhaust
Camshaft duration (@.050 in): 254'c1 intake / 264'c1 exhaust
Cylinder heads (P/N 12499255): Aluminum rectangular port, 118 cc 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
Rocker arm ratio: 1.7:1
Distributor (P/N 88961867): HEI
Carburetor (P/N 88961560): 850 cfm
Water pump (P/N 14058915): Aluminum, short-style
Spark plugs & wires: Included
Flexplate (P/N 12561217): 14"
Recommended fuel: 92 octane
Ignition timing: 36'c1 total @ 5000 rpm
Maximum rpm: 6000

Chevy Performance zz572 - 620 Base Engine Image

Part #: 12498792

zz572 - 620 dyno image

Installation Notes

  • Clutch linkage boss is cast and machined in block, but must be 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 additional parts (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.
  • Intended for pre-1977 street vehicles or all off-road vehicles.
  • Not intended for marine applications.
  • You do have a strong transmission and rear axle, don’t you?