you might be getting bleed down on the (lifters) actually valve compensating elements. which may not be a problem if that is the only time it does it. (ticks)
if you can catagorize it as a single tick it may only be 1 element. if it sounds like a whole bunch you may want to pull the valve cover and look at the chain, rails and the tensioner. you'll also be able to tell if the timing chain has been changed. look for a clip lock on the timing chain as you roll the engine over by hand.
search on timing chain and you should see a bunch of write ups on this subject as well.
1972 350sl Red/Blk 117k
1988 420sel charcoal/Blk 140k
1987 420sel gold/tan 128k
See My Cars at:http://mysite.verizon.net/res0aytj/index.html
Pound it to fit then Paint it to match!
There is only First Place and Varying degrees of last!
Old age and deceit will overcome Youth and Enthusiasm every time!
Putting the square peg in the round hole is not hard... IF you do it fast enough!
Old enough to know better but stupid enough to do it anyway!