Based on the LS-Series Gen-IV cast-aluminum block ... 7:1 compression ratio. Our final carburetor-equipped crate engine is a 540-horsepower 427-cubic-inch GM small-block compatible BluePrint ...

For the new ZZ6 350 crate engine that gets ... To make that happen, the engine has Fast Burn aluminum cylinder heads and an updated valvetrain inspired by the LS family of powerplants.

That was the double-take we did when we got word from Summit Racing that BluePrint Engines had started making a new pair of big-block-Chevy-compatible crate engines weighing in at that magical 632 ...