Join Date: May 2015
Location: Watkins Glen NY
Re: Cracked valves guides tip, can I rebuild head like this? (Pictures
Your heads have been core drilled and reamed for 1/2" OD replaceable cast iron guides! The thin top portion should have been spot faced down to the tapered portion below so a 1/2" x 11/32" positive seal could have been installed directly over the the new guide. Important thing is to get ride of the thin area even if you don't use positive seals as the original design o-ring seals work fine if your guides are in good shape. By the way those guides are good quality cast iron with spiral oil control ID's so at least your good to go there! A 1/2" x 11/32" positive seal cutter would remove that damaged area leaving your installed guides as is. This would be an easy operation if your heads are already off. I can send you the right cutter which you could return. We also have the best positive stem seals available if you want to go beyond the factory o-ring style seals?