250C valve clearance

I adjusted my intake valve clearances a while back to specs - they were off by about .001-.002". Now, though, I'm getting a very slight tapping when warm, not really enough to concern me, but want to know if I should be concerned if the clearances are open too much by at most .001". I plan to recheck in the future, but should I make this a priority?

Just checked the archives and found a post claiming that since the engine was designed to use leaded gas, the valve clearances are very important (answered my question I guess!). Spurs a second question of whether any clearance modifications should be made if I'm using unleaded? Any other changes?

[This message has been edited by wjbell (edited 05-31-2000).]