1970 340 Balance Problem...Bottom Line

I'll ad that yes a 70 340 from the factory is internal balanced. BUT... Somebody could have swapped out the crank for a newer one that is a cast crank which requires external balancing. As far as I know there really isn't a way to check from the outside what crank you have. Like Locomotion said the forged crank (internal balanced) have a wide parting line on the crank throws and the cast crank (external balanced) have a thin parting line. The only way I know to tell is to open up the engine and see what it has.

This has nothing to do with PastorToms car but I'd like to say about Mr.Shepards statement that 360 balancers "have a large flange added to the balancer" IS NOT CORRECT! The 340 balancer has a flange added to it but the 360 has a groove cut out of it. I've owned all 3 styles, 340 cast crank, 340 forged crank, and 360 balancer so I've seen them all. He also states that from 72 on 340 auto cars had a cast crank and manual cars had a forged crank. I have a friend that bought a 73 340 4 spd. Cuda brank new and when he tore it apart it had the cast crank in it. I have Mr. Shepards book and it is a good book but either his proof readers did a lousy job with it or he don't know balancers like he thinks. I also found a few other things that were questionable in it. Just because he wrote a book don't mean the's the #1 Mopar guru.