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A quick google search showed the 6.1 is an internally balanced motor, so as long as your builder didn't do something bizarre, there should be no counterweights on your flexplate/flywheel. Easier to make a conversion for an internally balanced motor as the flywheel/flexplate only needs to be...

Some motors are designed with crank balance weights built into the flywheel and balancer out back and front, as opposed to only having counterweights acting on the crank itself. When a motor is externally balanced (using weights on the flywheel or balancer), those items are essentially married...