The cast-aluminum cam cover used on the 230-inch Tornado six could easily be mistaken for a Mercedes part. Unfortunately, the Willys-designed OHC six-the sole engine offering for 1963 and 1964 Wagoneers before V-8s were added in 1965-was plagued by camshaft wear and oil leaks before being phased out by an AMC-sourced 232ci pushrod six during the 1965 model year. The OHC 230 Tornado's under-square 3.44 x 4.37 bore and stroke formula emphasized low speed torque while the free-breathing cross-flow cylinder head added power at highway speed. It was an interesting two-birds-one-stone strategy. By contrast, AMC bestowed the 232 six with an over-square 3.75 x 3.50 displacement recipe. Both are capable performers. Ironically, though the OHC six was nixed from civilian applications after 1965, a refined version was used in military Gladiator M-715 trucks from 1967 to 1969. A major change was the relocation of the motor mounts from the front cover to the sides of the engine block to eliminate oil leaks.