This problem of intake valve seats dropping has struck quite a few owners over the past few years. We first became aware of it with
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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
944s,944S2Cylinder Heads
Porsche 944s/968 Services This family of Porsche heads, including the 4 valve 928’s and 968’s, are simply magnificent. Nice port shapes with enough space to
Hoffman Automotive Machine (706)769-3783 
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