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If you look at the older Cadillac NorthStar heads and compare them to the pic.'s above, I think you'll see something, valves the same, +, ... water courses on sides and top different, but ...
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My understanding is the 4 valve heads didnt flow the numbers under very high boost like the 2 large valved heads. I think its been tried twice to my knowledge in the NHRA to no avail.
Its amazing that Ford and Chevy would put a Chrysler motor under thier cars to compete in the NHRA. Says a lot about the motor.
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