RAD hops up a 1957-vintage Chrysler 392 Hemi with 331 heads for extra power. A dyno test verifies the result with 436 horsepower.

While Dodge's HEMI engines are officially discontinued, you can still purchase a crate version of the HEMI 392. How powerful is it and how much does it cost?

With another HEMI V8-equipped vehicle headed for retirement, the Jeep Wrangler 392 Final Edition is selling for a premium and will likely have enduring rarity.