Leaderboard

I cleaned up a few valves at random and found them to be pretty worn with little margin left. The exhaust shown below is total junk with severe pitting. I have a few new intake valves, EngineTech and Sealed Power, most of which have been experimented with, primarily the back cut. The unmolested Sealed Power on the left with the EngineTech to the right compared to the used valves. Surprisingly, the seats aren’t too bad and dropping two new and a used intake valve into the heads show the stem heights to be spot on. Valves are inexpensive but a bigger issue is the valve guides. Five of the six exhaust guides are pretty good, however, five of six intake guides are awful. Time to check with the machine shop on possibly repairing. Any L27 head prior to 1995 would work but the remanufactured supply appears pretty thin or way overpriced. Failing that, I have my original untouched 1990 heads with 100k on them. They can be modified fairly easily to work with the internal pvc system by drilling one hole in each intake face. Oh well