Fixing a gaping hole in an 8ba guide bore!

[idiggett]

So i spent the past 3 years building this flathead. Doing all the homework and finding a choice block (or so i thought). This flathead ran a back-up generator in a hotel in PA until the 70s. Hours meter on the generator said 700 hours! (even had a maintenance ticket signed at 650 hours in 1969) When i brought it to the machine shop they said it did not even need to be bored, they could still see the hone marks from the factory.(i bored it .030 anyway) SCORE! So block in hand, the build started. Got her running about a month ago and things were great. (WERE great) Saturday i had her out when coolant started to POUR out the passenger side exhaust. I figured it was a head gasket...even though it was a pain it would be an easy fix. Removing the head i found the cylinder that was the culprit and put a new gasket on (even though i saw no damage to the original gasket). Started her back up and the same thing happened...coolant everywhere. So i tore into the engine deeper, fearing the worst....a crack that i over looked. Seeing nothing in the cylinder or valve area, i rolled the engine over by hand so i could see into the valve pocket. I found a pool of coolant (oh-shit) I removed the valve to get a better look....then i saw the horror that was looking back at me! a gaping hole in the valve guide bore! So after a tangent of some colorful language (that is still going on some 3 days later)...I thought.... i can fix this...or at least try.

So here are some questions

Does anyone have any experience fixing something like this?

I am making up a brass sleeve that i am planning on pressing in. i am going to ream the valve guide bore 1.035 to true things up and sleeve it with a .0005 press fit bushing. Obviously when i turn down the valve guide to fit, the spring will have to be installed from the bottom side. but a minor issue if it works....fingers crossed.

in the end...nothing may work....but i am gonna try. I am a machinist by trade and have access to some cool stuff. The guys at work are trying to help me with opinions....but i am looking for some real world experience fixing stuff like this.

Ron