News & Car Culture

OnAllCylinders Podcast: Hello ZZ632! Chevrolet Performance’s New 1,000+ HP Crate Engine (Guest Bill Martens from Chevrolet Performance)

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.

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  1. Frank Rivera says:

    How is it capable of running on pump gas with 12:1? What is being defined as “pump” in this case? 91 octane? 93? Do you have e to seek out a pump that has 95 or 100? Or is the timing just set way back? I’ve just always heard that 10.5:1 is about the limit for regularly available pump gas (i.e. 91/93 octane)

    • Hello Frank—According to Chevrolet’s data, 93 octane or higher is recommended. And it also reveals that the 1,000 hp dyno number was achieved on 93 octane. We’ve found some more engine specs from Chevy and we’ve added a link at the top of this post. Scroll up to check it out.

  2. Does drag racing void the warranty?

    • I’m guessing here, because this is language I found under a different motor, the ZZ572/620:

      Parts and labor warranty when installed by a GM Dealer or qualified installing independent Service Center (ISC) or when sold over the counter and REPAIRED by a GM Dealer or qualifying ISC. Parts only when consumer repaired or installed in non-highway application. Coverage limited to defects in material and/or workmanship of the specific part only. Warranty valid when all required components are installed on the same vehicle and purchased on one invoice.

      So for “Non Highway Applications” it’ll only cover parts, not labor. But again, that’s a complete guess using another engine as an example–I couldn’t find specific mention of warranty coverage for the new ZZ632.

  3. How much are they charging

  4. Vito Pasqualicchio says:

    What type of camshaft does it use?

    • According to Chevy:

      * Camshaft Type: Billet Steel Hydraulic Roller
      * Valve Lift (in.): 0.780 intake/0.782 exhaust
      * Camshaft Duration (@0.050 in.): 270º intake/287º exhaust

  5. Interested, what’s the cost of that beast?

  6. Can’t forget about E85 ethanol fuel aswell

  7. dan Herbrandson says:

    Can we use stock fit headers and what size tubes?

  8. What’s the cost on this beast? What kind of warranty is on it?

  9. Luke Simeon says:

    is it just me or does this thing have “ David Vizard “ written all over it lol

  10. I want one

  11. They must of put alot of effort into the cam LSA timing events etc to get it pump gas friendly with that much static compression.

    • Hey Sean, if ya get a few minutes, listen to the podcast embedded into the article. I asked Bill a few questions about what mechanical magic they used to make it all work at 12:1, and he goes into a bit of detail on the cam specs too.

  12. ned sassine says:

    Static compression and dynamic compression are two separate things with a camshaft that size matched to a ratio of 12:1 has no problem runing pump gas just dont get it to hot.

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