Are there any aftermarket head gaskets suited to boost with the m42?
I've read the standard CR is 10:1 and a friend of mine is running a forged 10:1 f4r at 330hp safe however I was thinking a slightly thicker gasket would drop it a little and be safer. I only plan to run 10-12psi with a positive displacement charger
Boosted M42 head gasket options
Moderator: martauto
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LeeUK
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bump, I wouldn't mind this information 
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rix313
- E30 Zone Team Member
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There is a Cometic gasket available I think. BMW also do a slightly thicker OEM head gasket to account for if people have had their heads skimmed to compensate.
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AdOz
- E30 Zone Newbie
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Thanks il have a look into that. I don't really plan on crazy boost maybe 10 psi but I'd rather be safe than sorry!