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Video: Giant 665 Cubic-Inch Big-Block Makes Almost 1,000 Horsepower

By Greg Acosta January 17, 2020“There is no replacement for displacement,” as the saying goes. While power adders are fun, sometimes, the application calls for brute strength. Such is the case with this engine build brought to us by our friend Jeff Huneycutt.

Put together by Prestige Motorsports for a customer who will eventually install it into an airboat (yes, an airboat), the engine has several special considerations and interesting touches which make it a very unique project.

“The point of this engine is to create an astounding amount of power out of a naturally aspirated pump-gas engine,” explains Huneycutt. “The Prestige team decided to do it with displacement. It’s an all-aluminum engine, so even with its large size, it’s still lighter than a smaller iron-block combination.”

10.7 Liters of Brute Strength

Building an engine with such a large amount of displacement can really only be done in one of two ways — with a block with altered bore centers allowing for a much larger bore, or with a tall-deck block allowing more stroke length from the crankshaft. For this engine, tons of RPM is not in the performance envelope of the engine, so stroke is the obvious source of the additional displacement.

In order to use a crankshaft with a lot of extra stroke, you need a block with additional deck height. For that, the team turned to Brodix and the 11.100-inch deck height version of its aluminum big-block engine block. Made in the big-block Chevrolet style, this well-engineered chunk of metal has extra-thick sleeves to accept a 4.600-inch bore, a .400-inch raised cam tunnel, and, of course, the enlarged 11.100-inch deck height.

In addition to the out-of-the-box features, Prestige also machined the block for oil squirters. Spraying a jet of oil on the underside of each piston will help keep everything cool since this engine will be run hard for extended periods.

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