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I just tore down my engine for a head/cam upgrade. I last had it tore down 4 years ago and everything looked great. The car has been running fine and I haven’t been having any problems. When I pulled my heads I noticed spots on the cylinder walls yesterday, almost all of them. They don’t catch my fingernail, appears more superficial. Anybody ever seen this?
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Cylinder wall spots, what’s causing this? 
