Update November 1, 2021: You can now order the ZZ632/1000! Click here to see the Chevy Performance ZZ632/1000 crate engine specs, including current pricing, at Summit Racing’s website.


Update October 21, 2021: We found more ZZ632 details from Chevy here—you can see some vital tech info, like camshaft specs, part number, valve sizing, and injector flow rate.

Chevrolet Performance is officially calling the ZZ632/1000 its largest and most powerful crate engine it has ever produced.

And after seeing the dyno chart, it’s easy to see why.

Yup, that’s a 7,000 rpm redline too. (Image/Chevrolet Performance)

Details on the Chevy ZZ632/1000 Crate Motor

As the ZZ632 name implies, the engine displaces 632 cubic inches. It uses a Chevy Big Block V8 Bowtie Sportsman iron block, similar to the ZZ572 crate engine, with a 4.60 x 4.75 inch bore and stroke.

The engine is naturally aspirated, no turbos or superchargers in sight. And it’s got a 12:1 compression ratio.

Atop the ZZ632 sits a pair of aluminum RS-X cylinder heads with fuel fed directly into each of their symmetrical ports—all of the ZZ632’s intake ports have the same length, volume, and layout. The exhaust ports are all identical too. Chevy explains that this ensures each cylinder produces similar power.

“This is the biggest, baddest crate engine we’ve ever built,” said Russ O’Blenes, GM Director of the Performance and Racing Propulsion Team. “It delivers incredible power, and it does it on pump gas.”

You heard that right.

On. Pump. Gas.

All told, Chevrolet says the engine makes 1,004 horsepower and 876 lb.-ft. of torque.

Here’s the Chevrolet Performance ZZ632 crate engine in all its glory. (Image/Chevrolet Performance)

Chevrolet Performance is bringing the ZZ632/1000 to SEMA this year, and our pals over at Summit Racing have a meeting with Chevy engineers soon to get all the juicy details.

Until then, you can get a few more specs at the official ZZ632 press release from Chevrolet Performance.