anyone balanced a stock 360 crank?

I built my 360 with KB107 pistons and Eagle SIR rods. Both of these are significantly lighter than the stock piston and rod. I had the rotating assembly balanced and they wound up taking almost a pound of metal off the crank. That much out of balance is going to be felt at idle not to mention the extra wear and tear on the engine. If you ate building the engine with Pistons or rods that are not stock replacement pieces i would say balancing is mandatory.

BTW, the don't balance the crank, it's the entire rotating assembly. The shop will need the crank, pistons, rings, rods. Plus if you are staying with the external balance they will need the harmonic balancer and the flex plate/ torque convertor (depending where the balance is) or the flywheel.