Harmonic balancer help

[siuauto]

Ok, I have a 360 that I built like 20 years ago and I am replacing my balancer because I think it may have slipped. When the engine was built I remember taking the pistons, flywheel balancer and stuff for balancing but and I thought I grabbed this balancer off a 340 for internal balance but I don’t remember. Can you tell by the balancer?

 

[RAT ROD AL]

That one is external balance. I believe

 

[furrystump]

See the weird offset in the top picture? That is a counter weight. External balance dampener.

 

[Locomotion]

Ok, I have a 360 that I built like 20 years ago and I am replacing my balancer because I think it may have slipped. When the engine was built I remember taking the pistons, flywheel balancer and stuff for balancing but and I thought I grabbed this balancer off a 340 for internal balance but I don’t remember. Can you tell by the balancer?

View attachment 1716400469

View attachment 1716400470

That is an early LA 360 balancer. Later at some point they redesigned them and instead of adding a counterweight, they removed weight from the outer ring on the opposite end. Magnum 360 balancers were different. 340 forged/neutral balancers were just plain & flat, like a LA 318 and the cast crank 340 had a smaller counterweight that had "USE WITH 340 CAST CRANK ONLY" cast into the counterweight.

 

[Oldmanmopar]

That is a 360 manual trans damper.

 

[cudamark]

That balancer looks in good shape to me. What makes you think the outer ring slipped? Check the timing mark locations by using a piston stop. That will tell you for sure. If it has slipped, I'd just get it rebuilt since it matches your existing engine.