Chevrolet unleashes the ZZ632 big-block V8

Just how much power does your project car need? 300, 500, or maybe 800 horsepower?

If you're a Chevy guy looking for a big-block V8 that's not an LS, you're in luck. The bow-tie brand recently revealed its biggest and most powerful crate engine yet. Meet the ZZ632, and it displaces 632 cubic inches. Convert that into liters, and you're looking at a 10.3-liter V8 motor.

“This is the biggest, baddest crate engine we’ve ever built. The ZZ632 sits at the top of our unparalleled crate engine lineup as the king of performance. It delivers incredible power, and it does it on pump gas,” said Russ O'Blenes, GM director of the Performance and Racing Propulsion Team at Chevrolet Performance.

With 10.3-liters at your disposal, this all-American V8 cranks out a monstrous 1,004 horsepower at 6600 rpm and a stump-pulling 1,187 Nm of torque at 5600 rpm. Unlike Dodge's Hellcrate and Hellephant engines which are supercharged, Chevrolet's ZZ632 is naturally aspirated. But how on earth was Chevy able to extract that amount of power from this giant V8?

Chevy just built a 10.3-liter V8 with 1,000 horsepower image

The manufacturer says that, unlike most crate engines, all eight intake and exhaust ports of the ZZ632 have the same length, volume, and layout. Meanwhile, fuel is delivered to the cylinders via eight port fuel injectors. The automaker claims that all cylinders produce the same amount of power. Taking Chevy's word for it, each cylinder puts out 125.5 PS, resulting in the engine's 1,004 PS rating. (Torque meanwhile is rated at 148.3 Nm per cylinder).

As for the engine itself, the iron block shares a mold with the ZZ572 crate engines that are seeing use in the Camaro COPO drag cars. But the castings for the 10.3-liter engine are machined to accommodate its massive displacement. The result is a bore and stroke that's 4.60 x 4.75 inches (116.84mm x 120.65mm). Compared to the 572 cubic inch V8, the ZZ632's bore is 0.040 inches bigger (or 1.016mm), while the stroke is 0.375 inches (or 9.525mm) longer. To provide the engine with better clearance for the long stroke, engineers modified both the block and connecting rods.

To ensure the engine's internals can handle all the added power, both the crankshaft and connecting rods are made from forged steel. Meanwhile, the pistons are built from lightweight forged aluminum. It also has four-bolt main caps and a forged rotating assembly to ensure strength and durability. During development, one engine endured more than 200 simulated drag strip passes on a dynamometer.

Interested in one? The ZZ632 crate engine will be on display at the 2021 SEMA Show in Las Vegas from November 2 to 5. Prices have yet to be revealed, however, they did say that Chevy Performance dealers will begin deliveries in early 2022.