what ever you do, don't use the positive seal valve seals, In theory, it should work better than any of the others, as they presumably don't actually "SEAL" the valve rather controls the amount of oil that gets by for lubrication. However I tried it, and had to tear my engine all apart after about 300 miles, with 3 valves stuck in the open position. These engines don't run well on 3 cylinders
