LesField

Yep valve seat problem in the end.

Flat6 Innovations

Mode of failure #7, first discovered in 2003.

I bet this happened about 3-5minutes after cold start up?

LesField

exactly that.

LesField

is there anything an owner can do to help prevent it happening? different type of coolest fluid?

alpine003

Can any of this be attributed to QA issues? I mean really, I've seen some wacky stuff but some of this stuff just gets even more wacky.

jetskied

On my engine they think a valve seat might have dropped and causes my broken valves, however disaster happen at the track with no warning whatsoever. The engine was running strong upto that point. Does valve seat just drop on these heads?

Imo000

Yes, they are friction fit, just like all the other valve seats on every other car out there that's made by all the manufacturers.

LesField

New engine is in and running like a dream.
I've started to put some of the old engine parts on ebay if anyones interested.

http://www.ebay.co.uk/sch/redbull916...1&_ipg=&_from=

Byprodriver

Interesting you had the early design IMS, is your 996 a 2002?

Glad you are back on the road!

Cuda911

Congrats on getting back on the road!!