i just purchased a ur underdrive pully set. i have a h23a1 engine. i was informed that the crank pully could hurt my engine since it may not be balanced just rite. and also heard that it wont hurt a h series engine. i am buildin all motor car. i did not install it yet, should i send it back? does anybody make a good underdrive crank pully?

 

if u can get a full refund for it i would send it back, every shop i go to says it could mess up your engine, of course there are people who have run it for years w/o problems and there are those that put one on and had something go wrong, but i wouldnt use it