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The 1968 GT 500 KR was a very special car. Many modifications were made to the stock GT Mustang. The 428 was the same Cobra Jet engine offered in the stock big block Mustang. It was the old 428 block with a lot of changes. The low riser, revised, 427 heads had huge rectangular ports. Measuring 2.34" X 1.34", the ports were larger than the 427 racing heads. A special dual-plane intake manifold held the mammoth Holley carb. Stronger connecting rods  and crankshaft were replaced the stock 428 pieces.

Dished alloy pistons were used with eyebrows, attached to con rods with full floating pins locked in with two retainers. This lowered the compression ratio to 10.7 to 1. Pop up pistons were available for drag racers. The KRs all received heavy duty front and rear shocks, the four speed cars got staggered rear shocks, power front disc brakes and power steering and big capacity rear drum brakes. 

Ford did not promote the increase in horse power the Cobra Jet engine had. It was advertised at 335 horse. That figure was off at least 20 percent. Remember during those years the insurance companies had started to penalize high horsepower cars. In fact, these years were the beginning of the end of cars like the GT 500 KR.  Total production of the KR's was 933 Fastbacks and 318 convertibles. One awesome machine....