Not a harmonic balancer. Pulley. I would think that it would be drilled to balance it. Just didnt want to put it on my cast crank engine and throw it off balance. I have the matching crank, water pump, and power steering pulleys. Don't know original application other than for a big block.

84 D150 440/727
79 /6 swb D150
1964 A100 window van. Just because it has spark plug tubes doesn't mean it's a Hemi.



If ya haven't been there, ya just wouldn't understand.