XK140 3.4 Valve Stem Height

[Mike_S (Mike Spoelker)]

Just had a discussion about this a few weeks ago.

Exhaust valve stem length after cutting and refacing valve seat. whats too long?

Howdie, new guy here. I have a honest to god barn find. Found a 1956 XK 140 that hadn’t seen daylight for 50 years. I bought new exhaust and intake valves, two burnt exhaust valves. Exhaust valve seats had been somehow made “different” from what is functional. Anyway had to resurface and cut down the valve face to make it functional again then lapped them in. I need to know the “too long” stem length of the exhaust valves. This is not a “C” head. Standard exhaust valve. Can’t find any re…