Thread: M3 to Z06
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      12-07-2012, 08:58 PM   #104
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Drives: F80 M3
Join Date: Apr 2008
Location: San Diego

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Originally Posted by Mookster View Post
GM claims its not an issue but we have seen some Z06s with failed valves that basically can ruin your entire engine. This has been mainly seen on tracked cars with 20+ hours of track time.

GM still claims its less than 2%...You could somewhat compare this to the E46 M3 with Vanos failure. I'd compare to E9X M3 but i never owned one so really not sure if it has any failures?

If you're a trunk junky then it'd make sense to upgrade the exhaust valves and guides but might as well port the head at that point.

When i bought my Z06, i thought i'd never get bored of its power and woulndt mod the engine so i ended up buying GMPP warranty(fairly cheap, 5 years/75k miles for $1500).

It appears i was wrong on nod modding the engine lol
Ok cool makes sense. Yeah I'm speaking from a track junky perspective. What is the typical cost of the exhaust valves, guides, port the head?

It also seems that a good idea is an upgrade to the oil sump/pump system to prevent the oil starvation issue in high G turns.

Are there any other issue that are common on the C6 Z06's that most track guys modify right away for reliability?