Originally Posted by windsoreight
I have my heads at the machine shop getting rebuilt. I bought a set of Crane teflon valve seals. The machine shop is telling me they are too tall. I have talked to 2 different motorcycle shop and got 2 different opinions. The first shop told me they will work fine. Just machine the height of the guide down. The other shop said they would not reccomend shortening the guide. They told me to get a different type of seal. Going to the Crane website their notes states thet the top spring may have to be removed. Has anyone run into this before? I don't see why shortening the guide would cause any harm. I am trying the get the bike together this weekend and if I can't get this straight it isn't going to happen. Thanks.
I would certainly NOT shorten the valve guides in what I assume is a Shovelhead. They are already too short. You could always use the stock Harley seals. Although they look flimsy, they will last if installed properly. They will fit, too.
Shortening the valve guides will lead to early wear and shorter life.