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Posted by Chriscase [63.199.240.230] on Monday, December 13, 2010 at 09:45:28 :
In Reply to: How To? remove really stuck valve guides posted by Philip in MA [75.69.221.62] on Monday, December 13, 2010 at 05:53:39 :
He used a 4lb hammer, hit the driver pretty hard. Complained that they were the tightest of them all.
I think I'd try a compromise- drill the hole somewhat bigger, then try the bfh. Bigger hole=less guide strength. That would avoid the screwdriver blade bit...
The high tech machinist would put the block on his big milling machine and drill them out totally with a piloted drill.
Did you know you can change them with the tappets still in? Drive them down, break the bottom off with a hammer, drive, break, repeat.