Gasket port openings are never the same size as the port itself. the gasket hole is usually larger. you take the new gasket you're going to use and you hold it up to the head, mark the hole on the gasket on the head and then start grinding head material (IF It can handle it) till the holes are all the same size...do this on the head as well as the manifolds. it streamlines the flow of air and exhaust.

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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