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Thanks for all the input.
I am going to pull the valve covers this morning and see if I can identify a problem.
dixbu: I will make sure all the nuts are still tight on the heads to rule out a pulled stud.
Whiz05403: I did not have the rockers refurbished when I did the rebuild. I think I measured the bushings and shafts to make sure they were in spec, but that was it. Is there a way to check on this now that everything is installed? There is definitely some play in the swivel foot or elephant foot on each of the adjusting screws. When I rotate the rockers back and forth by hand, I can see the ball move for most of the 0.004 valve clearance within the swivel. Could this cause noise? I always figured setting the clearance would take up any play in the swivel. Also, I only visually examined the portion of the rocker that runs on the camshaft. Could wear on this part of the rocker cause noise? I replaced all the valve springs as part of the rebuild. I have had the intake covers off before and confirmed that all of the intake valves are very hard to press open by hand. I will do the same check for the exhaust and also do a visual check with an inspection mirror to see if there are any signs of a broken spring.
sc_rufctr: I installed brand new valves, guides, springs and seals when I did the rebuild. Also did a 3 angle valve seat cut to get the seats cleaned up and in spec. I had multiple burned exhaust valves and had lost compression, prompting the rebuild. All that said, I did all of the work myself and may have missed something or screwed something up. I will check to make sure all the valves open and close freely when I get the covers off this morning. I also replaced all the bearings and had the crank polished as part of my rebuild and am very glad to hear it does not seem to be bearing related.
arry911: I will check all the cam lobes while I have the valve covers off. I assume I should see pitting or similar signs of wear if this is my problem. What specifically should I be looking for?
hcoles: I really hope this is not the valve guides as I just replaced them about a year ago. It is possible I screwed something up in the rebuild though. I was planning to drive the car for a ~120 mile trip later this afternoon, but I agree it would probably be prudent not to use the 911 until I get this resolved.
Thanks again for the help.
I'm heading out the the garage and will report back in a little bit.
Chris
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