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[quote="Randall_L."]From what I can see, it looks like the impressions were made with a punch rather than a grinder. There also seems to be some minor shaping of the area near the valve guide. The head seems too clean to have been placed in service with these modifications. Can you provide any more information regarding these modifications? Who took the picture, are there more, who performed the modifications, etc.? I would like to see a picture of the head after it has been in service for a while. Much like the skin of a modern golf ball, the dimples are believed to be better for gas flow. But that also involves a rotating ball and forces that may be different than those encountered in an internal combustion engine. I also wonder about all of the "sharp" edges created by the cratering and how they might create hot spots, incandesce and be counterproductive except in maybe diesels. More info please! Thank you.[/quote]
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