ProComp/Speedmaster aluminum heads

yellow rose said

I'm all for the straight edge, but a real bore gauge (like a Sunnen) for valve guides is pretty spendy. I've seen some of the cheaper bore gauges get down to about 1 inch or maybe a bit less, but I've not seen a bore gauge go down to .375 or .342 that wasn't criminal expensive.

If you find one, post it here. I'd buy one.

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Agreed. Quality bore gauges or any good measuring tool, cost real money (more than your motor for a full set) and in my opinion the Harbor Freight versions aren't worth the trouble they can cause when they are wrong. A good set of hole and snap gauges, a couple round standards, and a good micrometer or two can go a long way once you learn how to use them. They do take some technique to use and that's were practicing on a known gauge comes in. It's better than guessing. I like using granite surface plates for testing flatness but a good straight edge is good too. A good B grade 12'x18" surface plate can be had for less than $50.