Does Crank Stroke Affect External Balance

72DMag said

@70aarcuda Thanks for sharing. I guess that confirms it then. Machine shops don't even look at the stroke for balancing. Thus 4" stroke cast cranks can be balanced with stock 360 weight dampner, rods, pistons, rings, and wrist pins etc as long as weight is the same.

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But the stroker pistons are different than the stock ones. The block would probably be overbored which adds to piston weight. Anybody that thinks that a longer stroke crank won't weigh more and effect the balance is a fool. The bob weight is added to the journal regardless of stroke length and weight is added or removed as needed. I would never trust a stock balancer and flywheel to balance out anything other than the stock crank that the parts came off of. Even if you switch from a cast crank to a steel crank there is a difference in balance.