[Alan Cottrill]

I have what I'd consider a noisey top end.

I don't have a good frame of refrence as mine is the only 911 motor I'v ever heard.

I've adjusted the valves 3 times now. The last time, tripple checking my settings by going through the firing order 3 extra times. If anything the valves are a little tight.

I've posted about this before. valve guide wear was mentioned as a likely source of the noise.

if the guides were worn enough to be noisey, would I notice a lot of oil burning?

the reason I ask is because I was ready to pull the motor and do the top end when I realized it wasn't really burning any oil.

will adjusting the valves too tight cause a loud top end?

I followed the procedure in 101 projects to the letter. the only thing i question is my idea of snug. It takes some effort for me to remove the feeler and the feeler is slightly deformed by the tightening of the screw..

I've listened to the noise with an automotive Stethoscope

the noise is louder on some valves than others

the noise is louder at the valve covers over the rockers than on the heads, or manifolds.

the noise cannot be heard on the cylinders.

just a side note, the bottom end is supprisingly quiet.

I'm not trying to be cheap. I'd just like to drive the car for the summer if i can. I know if I tear it down now it won't go back together unitl the fall, thats just how things work out for me. (too many irons in the fire) I guess I'm just being selfish, it's just so much fun to drive.

any advise would be greatly appreciated.