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Replacing Valve guides is a total beyatch!
You have to heat up the head to near 200 F. and hammer the old ones out. And they don't wanna come out . . . . bad.
I tried heating up the head for installing the Supertech bronze guides. On my first attempt, I beat the $5 a copy, part into an unrecognizable lump of yellow metal. The Supertechs don't want to go in, anymore than the old ones didn't want to leave.
Subsequently, I lubed the Supertech with cutting fluid, stuck it and the 10mm, grade 8, driver bolt in the freezer. Yank it out, and hammer it in quick before the guide warms up. They go in less than a minute this way. Now, I've got to bore the whores out, before a valve stem can fit in. And replace the ruined valve guide.
A good running 4ag family motor should sound like a sewing machine at lower RPMs. If the valves are noisy and clattering, you probably need to replace the valve springs, and guides at a minimum.
This is not a job for the faint hearted, or clumsy. One stray hammer blow, and you've ruined the damn head!
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