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If you mean an underdrive crank pulley, then yes it could harm the engine if the aftermarket part is missing a needed, integrated harmonic balancer. If it is just an accessory pulley, that should not harm the engine though it would change the performance of whichever component is running on it, such as the AC, alt, or PS pump.
Search this site (upper left corner) because I am sure that this has been discussed here before. So really smart folks shared a variety of opinions.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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