I have 2 pulleys for sale from my Whipple off my 99 5.3L. They measure appox. 3 1/2" and 3 1/4". They are the flat face style not the cone. My system was the old 2 belt system with out the electronic bypass. The 3 1/2" pulley was the stock 6 psi pulley and the 3 1/4" made around 8 1/2 psi. Boost levels are different with every engine/ blower combo due to crank pulley size and engine displacement. I believe they are around $60 each through Whipple. Looking to get $25 each shipped. Please PM me because I dont get to check up on the post often and will get a quicker response by a PM.

 

pm sent on 3-1/2 pulley

 

Pm sent on 3-1/4 Pulley.