The Leadfoot monster truck was based on a 1977 Chevrolet El Camino. Owned and driven by Ron Dennis of Flagstaff, AZ. We do not know much about it, other than it was powered by a 600hp 425 Chevrolet engine that was coupled to a Turbo 400 transmission. The engine was later upgraded to a 468ci on alcohol. The 2 1/2 ton transfer case and 5 ton Rockwell axles were standard monster truck material, as was the 66″ tall tires. Photo via Monster Mayhem.