340 Hydraulic lock inspection update...

as YR says you can replace the whole guide
right now you have a screw in insert- like a K line- you can bore out the old guide and press in a new one
If you do not know an excellent machine shop in so cal PM me and I'll give you a couple of names
from the best- "you want it when" to cost effective
see if you can find out the brand of valves, sizes and if they were back cut
ps- with unleaded fuel I knurl and ream even new guides and I od hone the stems
still bad gas varnished up some guides on my 440 and I bent a set of smith brothers pushrods when I fired up after sitting for several months