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Valve Guide Specifications

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Anyone out there have specifications for the valve guide maximum diameter on a 7afe cylinder head? I've got an engine in bits that had horrendous oil consumption issues, the bottom half is all sorted now, but I still have to sort the cylinder head out. The valve guides appear to have a reasonable amount of play in them, so I'm going to knurl them to rectify this. I can't find valve guide specifications though.

 

Robert.

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