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The 500ss motors are known to somehow push the locator pin in and allow the ring to walk and catch the exhaust port. Happened twice on the same motor to me. I was told it was detonation. Even though the engine is made to run on 87, the quality of it is bad. After I did the top end I started running higher grade and it felt like it ran crisper. So I would alternate gas grades. Us 87 one fill up and higher for the next
 
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