Here is a twin cam piston with oil coked carbon on the top
[IMG]https://i.ytimg.com/vi/z2jzLptpFAg/maxresdefault.jpg[/IMG]
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Here is a twin cam piston with oil coked carbon on the top
[IMG]https://i.ytimg.com/vi/z2jzLptpFAg/maxresdefault.jpg[/IMG]