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when i bought the new yorker that had the motor in it, someone had put them on the motor before. I had them checked milled, did a valve job, hardened seats, and comp springs, I did the porting myself. All in all i got about $500 in them. My buddy owns a machine shop, he does great work, so i trust the heads. Im thinking its my deck height that's killing me.



Lack of quench is not what's killing it. What is the actual comp ratio? How great can the ring seal be at standard bore? 906 heads are the easiest to botch while porting. Grinding in the wrong spot kills flow. This is your 1st build learn from it and go forward. I agree go test and see how it runs. This same package with top notch ring seal,valve work, and decent compression ratio would show different results.
Doug