'1967 Holiday Race' ~ Plymouth GTX 440 vs. Pontiac GTO 400 'Ram Air'

In 1966 a 440 gtx auto car 3.23 gears ran 14.4 @ 98 mph and the 66 GTO 389 six pac 4 spd 3.55 gears ran 14.0@ 105 there is 7 mph difference, either the gto made more power or ws lighter by a bunch.