Thread: 454 or502

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Originally Posted by astroracer

AND if he wants something that is "drivable on the street" he needs to go OD for livable RPM's...
Mark

And if he goes OD, he'll need to go easy on the cam. All grinds have a "cruise rpm range" where the motor gets "up on the cam" and begins to be efficient. The motor will be inefficient under that range and you will have wasted money on an OD trans. Again, it's the combination of parts that you have to pay attention to.

Bottom line: Overdrive trans needs stock or very close to stock cam for the motor to be efficient in the cruise rpm range dictated by the OD trans. I got into an argument with a know-it-all on another forum who was convinced that his 300 degree cam (255 @0.050") was well-suited for use with his 700R4.

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