I should think it would be pretty easy to source some bronze and have valve guides turned (machined on lathe). You need to research what sort of interference fit is required for bronze guides in cast iron (I have data for bronze guides in aluminum). You may also have to heat up the block in order to install them. Please let us know what you end up doing.
I'm going to get my radiator shell re-chromed (I know original is nickel) and it was suggested I remove the DB badge. It appears to be an interference fit into the hole on the shell or is it soldered in? Anyone know the best way to gently remove it?
That last photo shows the pinstripe I uncovered after stripping a few layers of brushed on paint. I believe this dates to the original paint job (I felt like an archaeologist unearthing some long buried artifact)...
Thank 1930, I will definitely take a look on ebay for that. I'm doing plenty of cutting/grinding welding on the body as it is.... Thanks Don, I'll look for them.
Wow those are a little worse than I'd hoped. If they come off the car without crumbling, take a few more pics from the inside surfaces. Welding in new (flat) top flanges is one thing but I don't have the tools/skills to make patches for the curved areas.