KB's in a 318 with No Re-balance

My old bracket motor was a 440 with pistons 70 grams heavier than stock. No balance ran 11 years. Pulled the bearings and they looked like new so I reused them. Its setting in the corner of my garage for a back up motor. Ran its quickest times when I pulled it. high tens, low 11s. New motor is balanced cant see a difference in smoothness.