4v underdrive pulley questions

[bhuff30]

I pulled a set of underdrive pulleys from a 93 or 94 Lincoln Mark VIII with the 4v 4.6. The set consists of a smaller crank pulley and a larger waterpump pulley. The size difference is very noticable compared to stock. However, I can't find any name brand or markings on these pulleys. They look to be nice pices of aluminum though.

So can I bolt these onto my 97 GT 2v? The crank pulley looked to have 2 keyways, for whatever reason. Does the crank pulley act as a balancer? Also, do you typically need a different length belt for underdrive pulleys?

 

[wicked93gs]

yes, you should be able to use them, the crank pulley is not a harmonic balancer...all 4.6L are internally balanced, however it does act as a harmonic damper...according to what I have read anyway....and in my experience belt size will be different...but it doesnt hurt to try your old belts first

 

[bhuff30]

Thanks for the reply. One more question... Are these pulleys meant to be used as piggy backs? The car I pulled them from didn't use them as a piggy backs, but the crank pulley doesn't seem to have enough weight to be a damper at all.