Im in the mist of a 350 project and I plan on supercharging. I have tried to see if the procharger supercharger came with a pulley that supported both the main belt and the supercharger belt or does it come with a pulley that only supports the supercharger belt and bolts up to the front of the main crank pulley. Reason being I don't want to buy underdrive pulleys if the crank pulley will be provided with the supercharger. Does anyone know?

 

I have designed a 2 in 1 pulley for my P1SC. The design incorporates the stock L98 Serpentine crank pulley and ATI's 8" pulley (no aluminum spacer). I have one for myself and can get others machined. Email me if your interested.

 

I will definitely keep you in mind, does you pulley have the same benefits as an underdrive pulley, or even more?

 

My pulley is designed as a direct replacement to having (3) objects to align the centers. That would be the stock crank pulley, ATI spacer, and ATI blower pulley. I dont' know the weight of those 3 units but my design is 11.3 lbs and has (1) center of rotation axis vs. 3. My design is 6061 aluminum and that's where the weight savings come from. I only did this because I couldn't align the 3 objects in a way that didn't produce any sort of misalignment or vibration. I could easily iterate the design to incorporate an underdrive diameter on the crank side.

 

They normally come as either one piece or a set for the crank when you get a supercharger.
Either that or the SC company requires you to use your stock crank pulley.

You may get the alternator and W/P pullies, but I'd hold off on the crank til you get the SC.