Not Ranked
Food for Thought
Having time to daydream, I wonder if any of the smart people (unlike this writer) who kept their original 427/428 Cobras into the chassis dyno era had them tested with the as delivered, under the car exhaust system. When installed in the big Fords, the 427 was equipped with heavy, but efficient looking cast iron exhaust manifolds. These were a no go in the Cobra engine compartment, so clunky 390 units took their place. On the high revving 427, this change had to have killed power over 5000 rpm. Recently, a friend with an ERA sporting a built 427/454 engine with a strong cam and side pipes ran his car on a Dynojet and could not hit 400 at the wheels, which led to my original question.
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