When it comes to big, powerful crate machines, there’s a new sheriff in town, and his badge is in the shape of a bow tie. Yep, Chevrolet Performance just announced a massive 632-cubic-inch (over 10 liters for the metric crowd) block monster that makes over 1,000 hp and 876 lb-ft of rev. But as the man put it on the infomercial, “But wait, there’s more.” You see, this is a road engine, and it generates power from the gas station and without additional power.
What’s The Biggest Performance Crate Engine From Chevrolet?
“This is the biggest and worst crate engine we’ve ever built,” said Russ O’Blenes, director of the Performance and Racing Propulsion Team. “The ZZ632 is at the top of our lineup of unrivaled crate engines as the king of performance. It delivers incredible power, and it does at the gas station.”
What’s the New ZZ632 Rev For?
While the ZZ632 produces peak power at 6,600 rpm, the ZZ632 easily reaches the recommended maximum at 7,000 rpm. Fuel is delivered by eight port injectors with large block breathing through high flow CNC machined aluminum cylinder heads which have symmetrical ports. Traditionally, large blocks have been designed with a variation of the port shape from cylinder to cylinder. But in this case, all eight intake ports of the ZZ632 are the same length, volume and layout. Similarly, all of the ZZ632’s exhaust ports are identical. This symmetry ensures that each cylinder produces the same power.
This RS-X Symmetrical Port cylinder head is named for powertrain engineer Ron Sperry, who designed it as one of his final achievements after more than 50 years of work on General Motors performance and racing engines. Sperry also introduced a symmetrical port to Chevy’s iconic Small Block V-8 with the Gen III LS1 engine that debuted in the 1997 Chevrolet Corvette. And we all know how successful that design was!
The ZZ632 block iron shares the molding with the Chevrolet Performance ZZ572 crate engine, but the castings are machined to accommodate the massive 632-cubic-inch displacement. The bore is an increase of 0.040 inches compared to the 572-cubic-inch V-8, with most of the displacement gain coming from the 0.375-inch longer punch! To provide clearance for those long strokes, engineers modified both the block and the connecting rod. Forged rotating assembly and four-bolt main cap ensure strength and durability. During development, a single ZZ632 engine endured over 200 simulated dragstrip passes on a dyno! The ZZ632 will debut at the 2021 SEMA event in Las Vegas.
What’s Chevrolet’s Most Powerful Performance Crate Engine Before the ZZ672?
Aside from the discontinued supercharged LT5, which produces 755 hp, the biggest manufacturer Chevrolet Performance has to offer is the naturally aspirated big block ZZ572. This massive Dominator-fed beast pumps out 727 hp and 680 lb-ft of torque. Four-bolt electrics along with forged internals provide power, and a pair of high-flowing 310cc heads combined with solid roller cams help for a good time rolling. The ZZ632 adds 60 cubic inches to the party and makes an additional 277 hp; even better, it does it on a 93 octane pump gas!
Are There Other High-Power Chevrolet Performance Crate Engines?
Other powerful crate engines offered by Chevrolet Performance are the hard-to-find LSX-454 and LSX-454R. If you can find the LSX-454R expect to shell out around 20k bucks, but for that you get a solid roller racing mill that spins up to 7,100 and makes over 700 hp. For around 15k you can get a more tame, road-friendly LSX-454 mill that still makes an impressive 627 hp. Either way, you’ll have great block strength and displacement in a compact package that’s perfect for your hot rod projects.
Chevrolet ZZ632 Crate Engine Performance: Quick Facts
- Displacement: 632 cu in (10,348cc)
- Hole x Stroke: 4.60 x 4.75 inches
- Compression ratio: 12.0:1
- Strength: 1,004 hp @ 6,600 rpm
- torque: 876 lb-ft @ 5,600 rpm
- Recommended Maximum Machine Speed: 7,000 rpm
- Block: Tall Deck 632 Bowtie Sportsman, cast
- cylinder head: RS-X Symmetrical Port, CNC machined aluminum
- Crankshaft: Forged steel
- Connecting rod: Forged steel
- Pistons: Forged aluminum
- Fuel: Electronic port injection