A detailed explanation of the valve seat issues that plague M97 engines.
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AAPerformance Chinese 2.0 914/4 Knockoffs
Now available direct to the public.
986 996 Porsche Cylinderhead Cracks Explained
Click here to see video of a 996 3.4 M96 head being pressure tested, revealing a microscopic crack that was not visible to the naked
VW Type 4 Crankcase Breathing System Testing & Analysis
This article explores and unravels the mysteries surrounding the sometimes controversial issue of venting Type 4 cranckases, for street and track cars.
M96 & M97 PORSCHE CYLINDER HEAD SPECIFICATIONS AND GENERAL INFO.
M96/97 Valve Sizes, Chamber Volumes, Component details, Failure Types, Misc. Info.
Porsche M96 M97 Exhaust bolt removal
We see an awful lot of busted exhaust bolts in these heads. And we see a lot of failed repairs. We also see a lot
hamheads.com 
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