Chevrolet today introduced the largest and most powerful crate engine in the company's history. The ZZ632/1000 naturally aspirated V8 engine can produce 1004 horsepower and 876 pound-feet of torque.
"This is the largest and worst crate engine we have ever built," said Russ O'Blenes, director of General Motors' performance and racing propulsion team. "As the king of performance, the ZZ632 is at the top of our unparalleled crate engine series. It provides incredible power, and it relies on pumping air."
This 632 cubic inch Big Block V8 engine achieves maximum performance at 6,600 rpm and the recommended maximum speed of 7,000 rpm.
Fuel is provided by eight-port injectors, and the engine provides symmetrical ports through CNC-machined high-flow aluminum cylinder heads.
Traditionally, Big Blocks are designed with different cylinder port shapes; all eight intake ports of ZZ632 have the same length, volume and layout. All exhaust ports of ZZ632 are also the same. Symmetry is to ensure that each individual cylinder will produce similar power.
The iron block of ZZ632 shares the same mold with Chevrolet Performance's ZZ572 crate engine, but the casting is machined to fit a displacement of 632 cubic inches.
Compared with the 572 cubic inch V8 engine, the bore is increased by 0.040 inches, and most of the displacement gain comes from an increase in stroke of 0.375 inches. To provide clearance for long strokes, engineers modified the slider and connecting rod. The four-bolt main cap and forged rotating components ensure strength and durability. During the development process, an engine withstood more than 200 simulated drag belt tests on a dynamometer.
The RS-X Symmetrical Port cylinder head was designed and named for Ron Sperry, a powertrain engineer. This is one of his final achievements in the performance of General Motors and racing engines for more than 50 years.
Sperry also introduced a symmetrical port for Chevrolet's Small Block V8, which was equipped with the Gen III LS1 engine that debuted in the 1997 Chevrolet Corvette.
The ZZ632/1000 crate engine will be exhibited at the 2021 SEMA show in Las Vegas from November 2 to 5. Chevrolet Performance dealers will begin deliveries in early 2022.
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