Quote:
Originally Posted by greg737
So your exhaust valves were tight which causes them to remain in contact with the valve seat for longer than normal, which overheats them, burns and eventually deforms them (I think it's called "tuliped" like the flower).
But they've got to be really, really tight for this to happen. How on earth did they get that tight?
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actually, tight valves keep the valves from fully closing which makes their contact with the valve seat minimal. the extra air that passes through there heats up and burns the valves.
good question on why the valves were so out of spec, though. would be helpful to see what the valves really look like at this point.