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Hey all - going to be installing valve guides in my '50 327 block, curious about the appropriate reamer for this. The manual calls for a 11/32" reamer. From Goodson tools, would I want to go with a .343" or .3435", but they don't have something that specifically says 11/32, which is really .34375". Sorry to be a pedant again. They suggested the .343, but I just wanted to confirm this is what other folks would do.

Also, is this the type of reamer I would be looking for:goodson.com/products/1-4-drive-high-speed-steel-reamers?variant=33471808582

Thanks, all!

I'm not saying this is acceptable, but when I replaced the valve guides I found they were so close that I didn't ream them. That was a couple of thousand miles ago. 327 in my '53 Cavalier.

I don't know the exact spec for your engine, but usually something like 3 thou intake and 5 thou exhaust play is preferred. Between 0.3435 and 0.34375 is only 0.25 thou. So it won't matter, and you will actually be taking up 0.25 thou diametral wear on the valve stem.

Quote:

.002" and .004" clearance for my 327.

I think I've got this figured out. The specs on the stems on a new set of valves from Egge are:

Intake: .3425
Exhaust: .3400

So to achieve the .002 (intake) and .004 (exhaust), I would actually want a .344" reamer. Am I thinking about that correctly?