I haven't, I just put a dab of oil and put them on.

I have had trouble with valve stem seals twice over the last few years. First was in 2013 when I got my Edelbrock RPM heads back from shady dell. The engine was smoking and I couldn't figure out why. I milled the intake, i leaked it down, i had the guides checked, everything looked OK but there was oil puddling on the intake valve at shutdown and the headers were wet with oil. On one of my tear downs I noticed that Ryan used a different style seal than he had used when he had worked on the heads before, very similar but not the same. I talked to Ryan and he was out of the others and that these should be working fine. I changed them anyways and my problem was gone, I did 3 more drag weeks on those heads and maybe burned 2 quarts of oil between the three.

Fast forward to 2015 when my dad and I built a W2 stroker for drag week. We ran the motor 42 miles on a test drive and it was smoking just like the RPM heads. We used all comp stuff for springs, seals, retainers etc. The comp seals were the same style I had problems with on the RPM heads. But I used comps cutter for the guide, and I felt they installed OK so we used them. When we pulled the 416 a week before drag week to put the 360 back in the headers were wet with oil. Summer of 2016 comes and I change the valve stem seals on the W2 motor and it put it back in and there was no smoke.



The seals in the left of that picture above were the ones I had trouble with, I know lots of people use them but they didn't work for me. The one second from the left is what has worked great. I would recommend using that kind if at all possible.