Thanks to all who gave comment on this question. I've found several articles since then about newer motor oils and possible harm to flat tappet camshafts. My new engine is running a Racer Brown ST-14. It's been broken in on the dyno and I'll be sure to ask both Racer Brown and my engine builder how to keep it healthy. Nick Tiberio 63 Fury furyus63@xxxxxxxxxxx ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.