A 4/7-swap cam changes the engine's firing order, moving the power stroke for cylinder 4 to where 7 used to be, and vice versa. Seems to be from a Chebby perspective. http://www.hotrod.com/techfaq/113_0701_lunati_cams/index.html Thanks, Gary H. -----Original Message----- >What's a "4-7" cam? > >-- >Bill M ---- 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.