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If the engine really does have 12.5:1 compression, I don't see how 100 octane race fuel is enough even if you limit the revs to 7200 RPM or so. I would expect you to need at least 110 octane fuel.
Heads can "lift" due to detonation which is a likely outcome if you are not running a high enough octane fuel.
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Scott Winders
PCA GT3 #3
2021 & 2022 PCA GT3 National Champion
2021 & 2022 PCA West Coast Series GT3 Champion
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