has anyone used these? I heard something about them on the web, and can't find any information on them. they said they were thinwall bronze guide inserts (sleves) for the valve guides that are rather simple to install for the valve guides. I'm looking to know where I can get them, and how to install them. Thanks

 

You can find them at most parts stores that have machining facilities. Ask for either naval bronze or Ampco brass. Drill, ream, press in, ream to the finish size. It's time consuming, but not hard work.

 

never tried to install myself, mostly because i never had the reamers to do them with. i use to install them in my kart engines all the time. not a complicated process but more of a precission process. you can get the inserts from a number of sources. jegs and summit should have them. i'd buy from k line/atlas machine if i were looking for them or the tools to do them with.

 

Every head ive had come in to my work with bronze guides has needed them replaced. Stay away from them they wear out quick.

 

Interesting, since for the last 20 years, every head I that needed guide work, has had bronze inserts put in them....still running most of'em.

 

Really, I did a set not to long ago that every guide was wasted. They only had about 12k on them the guy said. I only recall a set or so that were good. I bet if you checked yours after many miles they would have more wear than regular cast guides

 

I've used them in just about every set of stock heads I've had worked up for the last .... oh, several decades ..... seem to be a whole lot better than leaving old wasted cast-iron ones there, even if not quite as elegant as replacing the entire guide. They usually run as long as, or longer than, the original cast-iron did before it got around to needing repair.