Sorry, I should have clarified. The car it came out of had a blown transmission, so it "runs like a dream" standing still. Meaning, super smooth, no ticks or knocks, no smoke of any kind, etc. I am a bit concerned that in my car, with a load on it, it will ping or knock with its 10.10 to 1 (supposed) compression rating. Yes, it has 516 heads. Thanks, Sean Paul Lennemann wrote: > > If the heads on the motor are closed chamber and it "runs like a dream" > on pump gas why lose compression? If you wanted to spend some money > getting heads redone why not put it into the originals and put larger > valves and hardened seats in them? ---- 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.