National Hot Rod Association (NHRA) rules dictate that engines for the Top Fuel, Funny Car, and Pro Stock ... based on the Hemi, a few key differences exist from a stock 426-cube engine.

The Chrysler Hemi engine was one of the most powerful engines you could find in a Chrysler car in the late '60s and early '70s. Its distinctive dome-shaped cylinders and large 426-cubic-inch ...