Do I need stock pulleys for a supercharger???

[IMPORTSMOKER]

Im putting a Vortech sc trim on my 92 and I have BBK underdrive pulleys on it, do I need to put the stock pulleys back on? I thought the kit comes with a seperate crank pulley that bolts on to the exhisting crank pulley and runs the blower off of that, so how would that effect the blower if it basicly comes with a new crank pulley (or is it a crank pulley?)..Im confused....what does the seperate pulley that comes in the kit go too?? please help

 

[L8 MUSL]

yeah, I believe it is a two piece pulley set up that bolts to your stock crank pulley with a spacer, so yes you will need the stock crank pulley.
If you don't have yours, go to a junk yard, 10 bucks.

 

[RydeOn]

You dont need one the kit comes with what you need.

 

[L8 MUSL]

You dont need one the kit comes with what you need.

There you go, my bad.
I thought it was just like the Powerdyne setup.

 

[IMPORTSMOKER]

so I can use my underdrives?? I heard using underdrives would give you less boost...how is this possible if the blower belt runs off of another pulley that is just bolted to the existing pulley??

 

[RydeOn]

the old N1ks ran off the stock crank pulley. the new ones and all the vortechs use a dual crank pulley system, so it is not an issue