[sgoldberg]

Originally Posted by sww914

There are times when a missed shift doesn't mean a rebuild. Porsche put the cast rockers in most of these engines so that they might break rather than bend the valves. You can do a leakdown test and it will tell you if the valves are bent. If they aren't, you can just replace the broken rockers and go.
One of my customers let his buddy (with $$$) share his car last year 3 times. 3 trips to the track, 3 missed shifts. Once, it broke 2 rockers, I drove up to Laguna, did a leakdown, replaced 2 broken rockers and they finished the weekend. The next time- missed shift, 4 broken rockers, bad leakdown.
It spun one of the cam nuts loose, cleaned the teeth off of the camshaft sprocket mounting flange, ruined the cam sprocket, bent 5 exhaust valves, broke the guide boss on one head, destroyed one camshaft lubrication tube, and I think that's pretty much it.
The next time it only bent the exhaust valves and broke 3 rockers, but I was finally able to talk him into racing valve springs with titanium retainers that he hadn't wanted to spend on previously. Only one missed shift since then, no damage.
I don't know what kind of rockers 964's have, it may be that none of this applies, but I really like to hear myself type.

Thanks for the advice! There may still be some hope! How do I do a leak down test in my driveway? What do I need and how would I do it? If the results go well maybe I could get rid of my depression! If not than I can futher prepare for my massive expense. Thansk again for your help!