Chevy ZZ632 is a 1,000-hp example of “no replacement for displacement”

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A few years ago, Mopar launched a beast of a crate engine called the Hellephant. It was a 426-cubic-inch (7.0-liter) supercharged V8 that produced 1,000 horsepower. Now Chevrolet Performance has an engine called ZZ632/1000 (an admittedly less fun name) that matches the Hellephant in power, and in a possibly more outrageous way: pure displacement.

The ZZ632 is a big-block Chevy pushrod V8 – emphasis on “big” – that displaces 632 cubic inches. For the metric slope, that’s a massive 10.3 liters, almost 2 liters more than the displacement of the old Dodge Viper V10. Official output is 1,004 horsepower and 876 pound-feet of torque, the latter of which is slightly less than the Hellephant’s 950 pound-feet. The ZZ632 also makes all this power on 93-octane gas that you can get at your local gas station. It even spins up to 7,000 rpm.

Chevy ZZ632 Dyno Chart

The engine is based on the same block used for the ZZ572, but with a significant increase in stroke and a slight increase in bore. It features a forged steel crankshaft with four-bolt headcaps, forged steel rods and forged aluminum pistons, all encased in a cast iron block. It is topped off with port fuel injection and a CNC machined intake manifold.

Engines will be available through Chevrolet Performance dealers and on sale early next year. No quote was given. Chevy technically says the bikes are for racing and off-road use, but we have a feeling some will find their way into some wild street machines.

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