I usually static balance (weight match) all the moving parts such as rods, pistons, etc. (including wrist pins, rings and pin locks) to a tolerance of 1/10 gram before calculating the bob weights. A dollar bill weighs one gram.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!