I too am getting near braking in my 440. Hopefully by Friday. Jim from Racer Brown told me 20 min varying from 3000-4500. Said if it gets hot, shut it down, let it cool and start again until I have run it for 20. So, this is what I plan todo. Open header break-in. Will most likely do mid-day on a weekday out of courtesy for the neighbors. They will be at work. Once broke-in, will change oilNfilter and take it to the muffler shop. -Tom On Tue, 23 Mar 2004 08:45:14 EST, WC43613@xxxxxxx said: > > I'll be breaking in my motor within the next week. My cam manufacturer > says > to break it in with only the outer spring then install the inner > afterwards. > I'm running a flat tappet solid cam. > > Bill C. > Tom 65 Dart GT 'vert 68 Plymouth 'vert Longmont, CO -- http://www.fastmail.fm - Does exactly what it says on the tin ---- 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. b7yoMz.