M96/97 Valve Sizes, Chamber Volumes, Component details, Failure Types, Misc. Info.
How to easily package heads for safe transport. Please read before shipping.
I originally published this article in 2012. Though I’ve made advancements in certain areas with all three of these heads, the basic info here is
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