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I went ahead and bought a new set of valves and had a shop do the head work. The problem wasn't obvious to me, but the shop said those same seats needed some work. When I get time I'll try to get some measurements of the bad valves.

Original valves. Rebuild was due to long term but small HG leaks leading to electrolysis pitting, so some metal had to be taken off the head and block. I did replace bearings, rings, etc even though the originals were still pretty good. Valve seals were leaking, so those got replaced. All...

102 views so far and nobody's had a valve rapidly lose clearance? And man, I forgot what a pain pulling the head is!

Early last year, my 1FZ developed poor compression on two cylinders cold, but the problem seemed to get better after warming up. I could hear it in the starter. When I checked valve clearance, I had two intake valves at zero, and several others were out of range. This is a motor I rebuilt 30k...