One of General Motors’ major headline-making announcements from this year’s SEMA Show in Las Vegas was the unveiling of the new ZZ632 crate engine – a massive 632 cubic-inch Big Block motor that produces 1,000 horsepower and 876 pound-feet of torque on 93-octane pump gas.
GM Authority of course had to find the ZZ632 Big Block during our visit to the 2021 SEMA Show and snap a few pictures of this outrageous new product offering from Chevrolet Performance. While the ZZ632 is undeniably large, it otherwise doesn’t look all that different from any other Chevy crate engine, although the bright orange-painted valve covers with ‘632’ engravings are a sure sign this engine is a bit more special than most.
The iron block that serves as the basis of the ZZ632 engine shares a mold with the smaller (yet still massive) ZZ572 Big Block, but features a 0.040-inch larger bore and 0.375-inch longer stroke, giving it an impressively large displacement of 632 cubic inches, or 10.3 liters. Peak power in this engine arrives at 6,600 rpm, while peak torque arrives at 5,600 rpm. The recommended redline for builders who choose to install the ZZ632 in their hot rod or classic car is 7,000 rpm.
Another highlight of the ZZ632 is its CNC-machined high-flow aluminum heads. These heads feature symmetrical intake and exhaust ports, thus ensuring all cylinders produce a similar power output. The design is dubbed the ‘RS-X Symmetrical Port’ cylinder head as a nod to GM engineer Ron Sperry, who also designed the symmetrical ports on the Chevy Small Block Gen III LS1 V8 cradled by the 1997 Chevy Corvette. The ZZ632 features special ‘RS-X’ engravings on the heads, as our photos show, in recognition of this unique head design.
Chevrolet Performance is currently taking pre-orders for the ZZ632 through its website, with production of the engine set to ramp up in the New Year. Deliveries are expected to commence in the first quarter of 2022.