Originally Posted by IntegraXTR
ummmm yes.
any engine internally balanced or not has harmonics obviously running back and forth down the reciprocating mass and even the clutch. in some cases the damage may not be noticible because it's only slight damage to the bearings but over time it's doing damage. in most cases joe blow blows up his super fast stock gsr with the race pulley before the use of the pulley takes out the engine or bearings itself. so the answer is yes they do damage but is it enough damage the kill the engine in a short period of time no..
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