Yes, and it would probably be the best idea to replace all the guides while you're at it. Also get the head resurfaced- - - -it's unusual for a gasket to blow if the head and block surfaces are flat within less than a couple of thousandths. It's best to core-drill the guides to leave only a thin shell before trying to drive the old ones out- - - -you really don't want to crack the head in the process of changing the guides. Stovebolt guides are 5/8" in diameter- - - -0.5625". I have a 7/16" drill bit with the first 3/4" ground down to 11/32" to use to thin the guides and stay on center.
Jerry

Edit: Asking "car questions" on Stovebolt will probably get you 40 lashes with a wet noodle by a moderator. It might be a good idea to keep engine questions generic, as to the vehicle it's in.

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Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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