12498792 ZZ572/620HP Street Monster

Part Number: 12498792

Retail Price: $0.00
Your Price: $12,995.07
Add to Cart


The GM Performance  ZZ572/620 is built with an all-new Gen VI tall deck Bow Tie big block and is filled with a forged 4340 steel crank with 4.375 inch stroke, shot peaned, forged 4340 H-beam rods, and forged aluminum pistons with full floating wrist pins. Built to last!

The redesigned rectangular port aluminum cylinder heads provide a pump gas friendly 9.6 to 1 compression ratio, hydraulic roller cam with 0.632 inch lift actuates the stainless steel valves.and chromemoly retainers, roller rocker arms, and dual valve springs are used to complete the valve train.

This engine makes an incredible 620 horsepower at 5500 RPM and 650 ft. lbs. of torque at 4500 RPM.

The ZZ572/620,  for when big is never big enough!


ZZ572/620 Base Engine
The ZZ572/620 features rectangular port aluminum cylinder heads that deliver 9.6:1 compression ratio in a pump-gas-friendly package.

General Motors Warranty Information


HORSEPOWER: 620Hp at 5500 RPM

TORQUE: 650 lbs. ft at 4500 RPM

Maximum RPM: 6000

Compression Ratio: 9.6:1

Partial Engine 12499190

Block 25534368 Tall Deck

Bearing Kit, Mains 88962212

Bearing Kit, Camshaft 12499434

Crankshaft 88961554 Forged 4340 Steel

Connecting Rods 88962926 Forged Steel

Bearing Kit, Connecting Rod 88961556

Piston & Pin 88962925 Forged Aluminum

Piston Rings 12499212 Plasma-moly

Camshaft 88961557 Hydraulic roller

Balancer 88962814 (SFI Approved)

Cylinder Heads 12499255 Aluminum

Head Gaskets 88961561

Rocker Covers (pair) 12499200

Intake Valves 12366987 2.25" Stainless steel

Exhaust Valves 88963128 1.88" Stainless steel

Valve, Springs 88963934 

Valve, Retainers 12366990 Chrome moly steel

Key, Valve Retainer 12366992

Key, Valve Spring 88963937

Rocker Arms 12361323 Roller 1.7:1

Lifters 17120060 Hydraulic Roller

Push Rod, Intake 88961559 High performance one piece

Push Rod, Exhaust 88961558 High performance one piece

Oil Pan 10240721

Windage Tray, Oil 88962187 Screened and louvered

Oil Pan Gasket 10106407

Oil Pump Assembly 88963707

Spark Plugs 5613878 - R45XLS

This engine has a Mechanical Fuel Pump Provision.

This engine is internally balanced.

This engine does not include a water pump, carburetor, flexplate, distributor, intake manifold.

The block has provisions for mechanical clutch linkage "Z bar" ball stud.