340 PISTONS: Between a rock and a hard place

so I would use the KBs at standard bore with standard rings gapped per KB instructions, which is more than average pistons, and probably where some who do not read instructions go wrong. and the KBs are probably very close in weight to the 662 gram units so rebalancing is not needed. years ago I rebuilt on old superstock 340 that had been rebalanced with L2322f 30 pistons, I was street and strip so was lowering compression with L2316f 30. Should I rebalance? called the old 340 guru Ed Hamburger, he said if the piston weights are within 10% no problem. did not rebalance, still runs great, thanks Ed.