The Blower Shop Supercharger Drive Kit - Belt / Crankshaft Hardware / Hub / Intake / Pulleys / Spacers - Polished - 6-71 Superchargers - Big Block Chevy - Kit-2711--Notes: Polished, W/59 & 50 Tooth Pulleys, 7.4lbs Boost (-25%) State Restrictions- Canada Restriction-NO -Emission Warnings--NO Truck Freight ---NO