L2266F it should have said not L2366F . I use the L2366Fs for cores for experimental engineswith 400 bores. sorry. L2266F is a direct replacement for 440 magnum 375 HP. The L2355F are direct replacement for 390 HP six pack. motors from the second year of production. The first year usedthesame as the4 BBl engines. KB wiegh 775Grams with a pin wieght of 191 grams. KB278 for instance. If I get time I will weigh a L2355F and see since I have a few in the shop still. Don Author of Return to Deutschland (True Adventure) Old Reliable (Mopar) http://altonapublicschool.faithweb.com/ http://seniordragster.bravehost.com/index.html [Non-text portions of this message have been removed] ---- 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.