Like many of you, late last year I received an email that started with three simple words: Bigger. Bolder. Badder. The correspondence was announcing the new Chevrolet Performance ZZ632/1000 big-block crate engine. With slightly more than 1,000 horsepower, the ZZ632 is Chevrolet Performance’s most powerful crate engine ever. What’s more, it comes with the modern convenience of electronic fuel injection, a crank-trigger ignition, coil-per-plug spark delivery, and can provide all those ponies while gulping on 93-octane pump gas. In a world that is clamoring to “go green”, performance junkies can rejoice that the internal combustion engine is alive and well.
The ZZ632 uses the same block as a foundation that is found in the ZZ572, albeit it does receive some massaging to accommodate the larger stroke and bore.
“This is the biggest, baddest crate engine we’ve ever built,” says Russ O’Blenes, GM director of the Performance and Racing Propulsion Team. “The ZZ632 sits at the top of our unparalleled crate engine lineup as the king of performance. It delivers incredible power, and it does it on pump gas.”
Although 7,000 rpm is the recommended rev limit for the engine, it actually achieves its peak 100,4 horsepower at 6,600 rpm. Peak torque of 876 lb-ft is realized at 5,600 rpm, and the engine produces over 600 lb-ft of it at just 3,000 rpm.
But what makes a ZZ632? What’s inside this mega-inch street engine? We were fortunate enough to get an inside look at one of these mills going together and thought you guys might also like to see what goes inside as well.
Inside is a forged crankshaft with a 4.750-inch stroke.
A Repurposed Foundation
When looking at the outward appearance, one might not realize the ZZ632 shares the same tall deck, splayed four-bolt-main iron block as Chevy’s slightly smaller ZZ572 crate engine. However, it has a bore of 4.600 inches and utilizes a stroke of 4.750…
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