V6 Balancing
With V6 engines, the percentage of reciprocating weight varies depending on the angle between the cylinder banks and whether the crankshaft is even-fire or odd-fire. For a typical 90-degree V6, the recommended reciprocating weight for the balancing bobweight is often 50 percent, the same as a 90-degree V8. But for some engines, like an externally balanced Buick 3800 V6, the recommended reciprocating weight is only 36.6 percent. Ford says to use 44 percent of the reciprocating weight for its odd-fire 4.0L V6, but to use 50 percent of the reciprocating weight if a 4.0L V6 has a split-pin, even-fire crank. For its 90-degree 3.8L V6, Ford recommends using 39.4 percent of the reciprocating weight for the bobweight.
The bottom line here is that the recommended reciprocating weight for the bobweight can vary depending on the application. So make sure you find out what the recommended percentage is so the bobweights will be correct for the application.