This time it is a big G head.  Found out today one of the valve guides and bosses that centers the spring is cracked all the way down to the spring seat.  The machine shop believes and I understand the point that the guide and boss needs to be ground all the way to spring's seat.  He "thinks" a cupped type spring spacer will control the spring bottom.  Seems like the spring would walk around even with the cupped spacer.  Also, it seems like there wouldnt be enough guide to keep the valve from wobbling.  What do some more experienced think.  Hopefully this wont turn out to be another head going to scrap!  What a messy dissapointment.

I wonder, but dont know, if in the process of relieving the top of the guides a cutter didnt snag and produce the crack.  Valves were all removed when I took the heads in, and I had messed with spring height checking, but sure didnt see any crack.  It should have been impossible to miss, i.e. big. 

With this development, on top of the fact that the heads have been in "shop" for a full 6 months, there will be a new shop next goround.

Mike

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.