As far as I know the factory never made one. In the rare instance where a later 400 or 440 was ordered with a 4-speed, they used a steel crank. The only external balance flywheels I've ever seen were big block trucks with 12" flywheels. Mark ----- Original Message ----- From: "MO ( Steve Mick)" <micher@xxxxxxxxxxxxxxx> To: 1962to1965mopars@xxxxxxxxxx Sent: Monday, October 11, 2010 6:19:17 PM Subject: flywheel- crankshaft. Hay all, after weighing all the info , I am going to leave the 78 440 engine together. not changing the external balance crank to my 413 internal balance crank. Since I will use a 4 speed, I now need to find a used 10 1/2 "flywheel for external balance. I don't want to modify an internal balance flywheel and I know about the new one from" 440 Source. " So what engines and years would have an interchangable 10 1/2 " external balance flywheel? Thanks for any help......................MO {Steve Mick} http://stevemick.shutterfly.com/pictures#Part%202 ---- 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! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.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! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.