My '73 had air conditioning sometime in it's previous life. By the time I took ownership most the condenser was gone, so I removed the rest of the components. My question is, can I replace the harmonic balancer/pully to a non-a/c type without having it balanced on the crankshft. In other words, are the balancer's internally or externally balanced. It is a rebuilt L-24.

The 240's had their a/c added by the dealerships. They simply bolted a pulley to the front of the harmonic balancer. It's a single pulley held on by countersunk allen head screws through it's face. My 1972 is this way and I'm assuming it didn't change for 1973.

Thanks for the info, I was going to replace the balancer with a non-a/c type, but I think I will wait until I can find out how they are balanced. If I can remove the extra pulley on my current balancer I will, logically there would be no need to re-balance the pulley.