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I have an original 1969 Ford Cobra that was built to get them certified for NASCAR and it has the "R" code engine in it. The bottom end is all LeMans rods and stuff and the heads are 427 Medium Riser heads. That is what they used on them from the factory. The "Q" code 428 Cobra Engine doesn't put out as much power stock as the "R" code and it doesn't have the better bottom end. I had mine dynoed and though it is rated at 335 horse, from the factory it put out 440 horse. That is with stock exhausts and everything hooked up. So it is easy to get 500 horse out of one of those engines.
Ron
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