CMW Trucks - 1947 - 1972 Chevy Truck Parts



 

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Discontinued

ZZ572/720R Base Engine

From the special, orange powder-coated 572 block, aluminum rectangular-port heads, and 12:1 forged aluminum pistons, the ZZ572/720R long block includes all the features of the Deluxe, minus the water pump, carburetor, water intake manifold, distributor, and spark plug wires. This gives you the option of using a carb you already have.

GM Performance Parts integrated, durability-tested, and validated this combination and determined it works best with the Deluxe version’s 1090-cfm Demon four-barrel carburetor, tall-deck single-plane intake manifold, HEI distributor, aluminum shortstyle water pump, and 8 mm spark plug wires. Order all the parts to complete the engine from your GM Performance Parts dealer or finish with your custom parts.

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

Possible Applications

  • Build a solid 9-second bracket car
  • A street car with no equal
  • A show car that shakes the trophies out of the judge’s pocket

*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.

ZZ572/720R DELUXE TECH SPECS:
Part Number: 12498826
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'c1 intake / 274'c1 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
Maximum rpm: 6750

Chevy Performance zz572 - 720R Base engine image

Part #:12498826


zz572 720 R base 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
  • Requires internally balanced flywheel for manual transmission applications.
  • Intended for pre-1977 street vehicles and all off-road vehicles.
  • Not intended for marine applications.
  • Big, sticky slicks will help hook up this monster!