This is a Chevrolet ZZ632/1000 crate engine from GM Performance Parts, it’s the most powerful crate engine ever offered for public sale from General Motors – producing a staggering 1,004 bhp.
To call the ZZ632/1000 a big block V8 almost seems to be underselling it, the external dimensions fit the name of course, but internally it has a displacement of 632 cubic inches (10.35 liters) and it generates enough torque to move the island of Manhattan.
Above Video: This is the official introduction film for the Chevrolet Performance ZZ632/1000, and it goes over its design and performance in detail despite its short run time.
The Chevrolet Performance ZZ632/1000 Crate Engine
The Chevrolet Performance ZZ632/1000 is a 632 cubic inch (10.35 liter) naturally-aspirated, big-block V8 crate engine producing a whopping 1,004 bhp at 6,600 rpm and 876 lb ft of torque at 5,600 rpm. It’s the highest-output engine Chevrolet has ever sold in crate form.
GM says the engine is designed for off-road and motorsport applications, as it’s not emissions compliant, but more than a few road cars have even fitted with them on the sly. Or not on the sly, depending on your state’s specific regulations.
Impressively, the engine runs on 93 octane pump gas and doesn’t need higher-octane racing gas, this means it can be run much more cheaply than a high-octane-gas-only racing engine.
The ZZ632/1000 is built on a tall-deck cast iron block with siamese cylinder bores, four-bolt main caps, and it has a 4.600 inch bore and 4.750 inch stroke. The rotating assembly includes a forged steel crankshaft, 4340 H-beam forged steel connecting rods, and forged aluminum pistons.
The compression ratio is 12.0:1 and the camshaft is a hydraulic roller with 0.740 inch intake and 0.744 inch exhaust lift and 258/270 degrees of duration at 0.050-inch lift, ground with a 113-degree lobe separation angle.
The aluminum SR20 cylinder heads, originally developed specifically for drag racing, use relocated intake ports and large 2.45 inch intake and 1.80 inch exhaust valves, supported by shaft-mounted rocker arms. Valve spring pressures are set at 400 lbs open, with stability confirmed during dyno runs at up to 7,000 rpm – impressive for a pushrod engine.
Induction is handled by a high-rise single-plane aluminum intake manifold and port fuel injection, managed by a Holley EFI ECU and GM sensors. Coil-near-plug ignition and a 58x reluctor wheel provide the spark reliably – especially at high rpms. The engine ships as a turnkey crate package under GM part number 19432060, which includes the wiring harness, sensors, throttle body, and ignition components.
The ZZ632/1000 was publicly introduced in late 2021 and physically debuted at the 2022 Hot Rod Power Tour in a custom 1967 Camaro. It’s built entirely in-house at Chevrolet Performance’s facility in Pontiac, Michigan, where each engine is dyno tested and visually inspected before shipping.
The ZZ632/1000 Crate Engine Shown Here
The engine you see here is an original, unused ZZ632/1000 crate engine that was bought in 2024 as the seller had the intention of using it to power an all-new 1957 Chevrolet custom build. That car never got built as they found a suitable car and bought that instead, and so this engine is now being offered for sale.
The engine you see here is an original, unused ZZ632/1000 crate engine that was bought in 2024 as the seller had the intention of using it to power an all-new 1957 Chevrolet custom build. That car never got built as they found a suitable car and bought that instead, and so this engine is now being offered for sale.
It’s is secured to its factory shipping pallet, designed to allow it to be moved easily with the use of a forklift. It does weigh 770 lbs (349 kgs) so the use of a fork lift is recommended for obvious reasons.
It’s now being offered for sale out of Saint Robert, Missouri on Bring a Trailer. If you’d like to read more about it or place a bid you can visit the listing here.
Images courtesy of Bring a Trailer
Articles that Ben Branch has written have been covered on CNN, Popular Mechanics, Smithsonian Magazine, Road & Track Magazine, the official Pinterest blog, the official eBay Motors blog, BuzzFeed, Autoweek Magazine, Wired Magazine, Autoblog, Gear Patrol, Jalopnik, The Verge, and many more.
Silodrome was founded by Ben back in 2010, in the years since the site has grown to become a world leader in the alternative and vintage motoring sector, with well over a million monthly readers from around the world and many hundreds of thousands of followers on social media.