Quote: Do my aluminum heads give me a "cushion" on the gas I am able to use? I do use premium but have accidentally used regular with still no valve chatter.
(1) yes (2) if you have an aggressive curve & still no knock with regular I would use it. EDIT 180 is healthy, the timing does need to come in much faster (what springs do you have?) which will likely make you stay with premium. If the AF ratio is adequate you may very well need less cam and or more converter (not my area). Keep us posted
Last edited by RapidRobert; 07/13/1412:36 AM.
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