This article explores and unravels the mysteries surrounding the sometimes controversial issue of venting Type 4 cranckases, for street and track cars.
M96/97 Valve Sizes, Chamber Volumes, Component details, Failure Types, Misc. Info.
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
I originally published this article in 2012. Though I’ve made major advancements in certain areas with all three of these heads, the basic info here
We have seen cylinderhead cracks in all models of M96 engines used in 986 Boxsters and 996 911’s up to and including model year 2001,
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