Ken,the only tuning we did was on timing.We tried everything from 30 to 38 with the 91 gas.The motor liked 34 the best.Exact same setup except iron heads and 9.5 CR,that combo liked 38 the best.I think the small chamber KRE Dports are diff from the larger chamber Dports.HP was almost the same,480ish for 434CI.Tom
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