Re: Valve guide removal on the L-134
I have never done valve guides in an L134, but lots of farm tractor engines and I think this procedure will work: first drill and tap the old guide for the next larger size bolt. second, decide if you will drive or pull the guide (this is determined by engine design and if the cam will be removed), if you can drive the guides out then screw a scrap bolt in from the opposite direction and then use a long punch placed down into the guide to drive it. the theory here is that drilling and tapping will weaken the guide, and driving through the guide will do two things, prevent mushrooming the end of the guide and slightly shrink it as the punch will tend to stretch the guide rather than compress it.
If the guides will be pulled then simply screw all thread in the guide and place a stack of washers over the valve seat, then run a nut down on it, if the guides are not to tight and the all thread is of good quality they will come out.
good luck, jjc