It’s been used multiple times through the generations of Ford’s Shelby-fettled pony car, but the first version—the 1968 G.T. 500KR ... as making an insurance-friendly 335 gross-rated horsepower but ...
This engine came about not as a result of dedicated engineers trying to squeeze more power out of a new design, but from a dealer tinkering on new cars to sale on his lot. Using Ford's then-new 428 V8 ...