Balancing a 360

Well part # EAG-103603580 on Summit website says that it is externally balanced, but I definately would have it balanced with a new crank and pistons to go with the rest of your stock stuff. If you are using a stock balancer, many times the rubber shock absorber ring can deteriorate and the outer piece will slip a bit, which wouldn't be good on a exernally balanced motor. Good luck with this, Rob