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GM ZZ632/1000 Crate Engine Listed at No Reserve
A 632ci V8 crate engine, the most powerful GM has offered, is up for auction in North Dakota with no reserve and zero miles.
By Charlotte Redford · 3 min read
A GM Performance Parts Chevrolet ZZ632/1000 crate engine is being offered at no reserve in Bismarck, North Dakota, giving buyers a rare chance to acquire the most powerful turnkey V8 General Motors has ever produced. The engine has not been started and was acquired by the seller in June 2026.
At its introduction, the ZZ632/1000 was the largest and most powerful crate engine in GM's catalogue. It is rated at 1,004 horsepower and 876 lb-ft of torque, thanks to a 12.0:1 compression ratio and 632 cubic inches of displacement. The engine uses a cast-iron block shared with the ZZ572 crate engines but machined specifically to achieve the larger 632ci capacity.
Inside, the ZZ632/1000 features a forged steel crankshaft, forged steel connecting rods, and forged aluminum pistons. The symmetrical aluminium cylinder heads are known as RS-X, named after powertrain engineer Ron Sperry, and carry inscriptions on their ends. Electronic port fuel injection feeds the engine, while a high-rise intake manifold and orange-finished valve covers with 632 branding complete the package. A Chevrolet logo oil filler cap is also included.
The listing includes a Holley Terminator X EFI system and wiring, adding to the engine's appeal for builders planning a serious performance project. Because the unit has never been started, it remains in as-delivered condition, a factor likely to matter to collectors and racers alike.
GM's crate engine programme has long allowed enthusiasts to buy factory-built powerplants off the shelf, but the ZZ632/1000 sits at the top of that range. Its combination of huge displacement and modern fuel injection makes it a natural choice for drag racing, resto-mod builds, and high-end street machines. The no-reserve format means the engine will sell to the highest bidder regardless of price, a setup that often draws strong interest from the performance community.
For British buyers and collectors, the listing represents a chance to own a piece of American muscle-car engineering without the usual premium attached to a reserve auction. The engine is located in North Dakota, and shipping arrangements would need to be made by the winning bidder. Full details of the sale, including the Holley EFI components and the engine's unused status, are available through the auction listing.
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