Valve seals tore on break in

Bewy said

[1] Were the stems/seals pre-lubed?
[2] Could they be 11/32" valve seals, BB uses 3/8" valves?

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Well I pre lives the valve shafts with WD 40 but not assembly lube. Just double checked and they are 3/8 seals. And we’re not difficult to install over the valves.