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Kaase Complete Engine
You've likely never uttered the terms "crate motor" and "Boss 429" in the same sentence, but you can now thanks to Jon Kaase Racing Engines. Designed for pump gas, and assembled from all new components, the displacement options are vast. One of Kaase's personal favorites is the 521, sporting a 4.30-inch forged stroker crank, hydraulic roller cam, and 771 horsepower. No, it's not cheap at $18,900, but then again, big horsepower never is. With the entire Boss Nine top end running around $7,000, Kaase figures a good wrench could build an impressive piece themselves for $10-12,000.