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12498825 - 572 Partial - (Shortblock) (720 HP Verison) - Discontinued

This product may require vehicle validation(s) for proper fitment. Please contact us to confirm correct vehicle fitment and usage.

Availability: Item has been discontinued and is no longer available
Shipping: FREE 48 State Shipping


GM Performance Parts Largest Displacement, Most Powerful Crate Engine Ever!

This is the shortblock used to build GM's 572/620 HP Crate Engine.The final horsespower numbers will depend upon what you bolt to the shortblock.
Maximum Recommended RPM- 6750
Compression Ratio- With 118cc Heads 12.1:1-/With 110cc Heads 13.1:1

The all new ZZ572/620 is built around an all new Gen VI tall deck Bow Tie block.And is filled with the highest quality, most durable parts that GM has to offer! This is a serious big block, for a person looking for serious street/strip horsespower.Each 572 is assembled by hand and is built from the following list of parts-

Block-part # 25534368 - Sportsman, 10.200" Deck height, one piece rear main seal,Mechanical fuel pump provisions, fully CNC machined block,This block is powder coated Chevy orange, Honed cam and crankshaft bores, nodular iron 4 bolt main caps with grade 8 bolts splayed 16,machined for production type Gen VI roller camshaft.

Crankshaft-part # 88961554 Forged 4340 Steel, Internally balanced, crossdrilled 4.375" stroke. This crankshaft is manufactured by Callies for GM.

Connecting Rods-part # 88962926 Premium 4340 forged steel "H" beam with 7/16" rod bolts.These rods are manufactured by Eagle for GM.

Pistons- part # 88963227 Forged Aluminum. These Pistons are manufactured by J.E. for GM.

This 572 Shortblock does not include:
Camshaft or any valvetrain components
Oil pan
Oil pump pickup
Timing cover
Harmonic Balancer- Neutral balanced Damper must be used with this engine such as GM 88962814
Flexplate Or Flywheel - See notes below for flywheel reccomendations.

This engine does have a mechanical fuel pump provision on the block.
This engine block has provisions for mechanical clutch "Z" bar linkage in both locations including the 65'-76' Big Block Corvette location.
This engine uses a Gen VII internally balanced Flexplate part # 12561217 & 6 bolts part # 3727207. If a manual transmission flywheel is needed, part # 12555135 & 6-839756 flywheel bolts must be used, Remember that unlike the 454 and 502 engines, this engine is internally balanced. Using the wrong flywheel/flexplate can destroy the engine due to a severe out of balance situation.
A tall deck rectangular port intake manifold, or a standard deck rectangular port intake manifold with end rail spacers and a slip collar distributor must be used with this engine. The Gm intake manifold part # 88961161 is a special tall deck intake that has integrated end rail spacers, and the distributor mounting pad is modified so that a standard chevy distributor fits.
Any big block water pump can be used on this engine without problems.


  • 12498825
  • 12498825
  • Chevrolet Performance Parts
  • Item has been discontinued and is no longer available
  • New


Shipping Information

  • Item Requires Shipping
  • 426.0 lbs.
  • W44.0000” x H39.5000” x L36.0000”
  • FREE 48 State Shipping

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