Thanks for the information. I have a 4 valve head I would really like to try, but thought I should get the cam ground to the newest specs. My diesel guy says there is free horsepower there. I don't know. He admits no big difference in the flow on a bench. Just says they scavage better. I don't want to go over 2600. I have a boat motor dyno now. I am going to know what makes a difference, when I get it figured out.
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