The Blower Shop Supercharger System - 192 - Roots Style - Single 4150 Setup - Polished - Short Water Pump - Small Block Chevy - Kit-3110--Notes: 6-8 lbs. of Boost w 9.1 CR. 16-Rib Blower Pulley, Polished,w/3.85 Dia 16-Rib Blower Pulley. 4150 flange . Polished State Restrictions- Canada Restriction-NO -Emission Warnings--YES Truck Freight ---NO