Tappet block o-ring removed, and found to be "melted". This is certainly the incorrect o-ring, I have learned. The "Emgo" gasket sets do not come with a tappet block o-ring, and I have been installing a o-ring that is not capable of handling those kind of temperatures. Ordered correct o-ring from M.A.P. cycles, they are in agreement with me. New seals should be here tomorrow, and I'll get her back together by Sunday...