We ran 2% overbalance on the Grocery Gettet engine 541 nitrous oxide. That was the advice of my engine shop from day 1. We had excellent bearing life with those engines. The nitro engines were 4% overbalance from advice of Bill Miller, Pat Dakin (top fuel) and the Zombies. We had tons of main bearing issues due to oiling system problems not related to balance. Once the main bearings received plenty of oil at proper pressure, the overbalance was probably fine. These results are completely anecdotal though. It’s hard to produce hard data on what is the perfect balance for a race v-8.
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