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Does this thing still have the the 6 pak rods in it?

Any chance the shop was just correcting the flywheel to zero?

Kevin



Ext bal isn't for six pack rods, it's a '77 cast crank motor.
I assume the pistons are lighter than OEM and the shop removed weight from the flywheel to make up for it.

The wheel balancer idea won't work. It only will tell you the degree angle and how much weight to add, you also need to know how far from the crank centerline to place it.