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85 pistons in a 90

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lycominglou

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Ive never been around it or anyone that has. A guy asked me if its worth the time to do it? so i thought i would ask. is it a noticable difference? just from reading forums sounds like the top of the piston needs to be tapered some or grind out around the spark plug boss some but what is the correct way to go at it?
 
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