Currently have bronze valve guides in the heads of a '63 289. The guides are not tapered at the top (as w/ the std. Stude' guides). Has anyone used the standard umbrella type valve stem seals w/ the flat top bronze guides? Or, is it necessary to use the positive seal type as is usually used w/ these?
Any and all comments are appreciated - The heads are on the work table, ready to assemble to the short block.
Thanks for your help, Paul TK