okay...thanks for the info. I have been searching zcar also and they say about the same thing. Since it was pretty quiet and then got really obnoxious clicking I thought it was far off. I seem to remember when I first got the Z it was clicking then got a valve adjust at the dealer and the clicking went away. I guess they did it too tight. It sounded like a diesel engine it was so bad. It was worse with the windows up. I think I have a little valve slap at stock settings. I will go .002 tighter and leave it at that. Can the lobes wear with too little clearance? Or is that from the rockers? The mechanic reused them on the rebuild even though I wanted new ones- 15,000-20,000 miles on them. I've always used synthetic oil and changed it regularly so it shouldn't wear so much in 30,000 miles. What are the symptoms from a burnt valve? This is the first adjustment in 30,000 miles on a rebuilt head so it has been too tight for awhile. It has been running fine, revs easily to 7k in 1st and 6.5k in 2nd.
Thanks