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My setup is currently at the machine shop. They informed me that my aluminum heads have some corrosion in the exhaust ports from using RACE gas.Intake ports are clean. They said it is pretty common. Should I be worried?
I run Sunoco 112 with 13.5 compression and 35 degrees of timing.
Mike

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I wouldn`t worry about it myself and would have em cleaned and polish the heck out of em...............