Large 3/4" bearing with 5/8" shaft. Bigger pump impeller & Larger cavity size.
This PumpUses The 5/8 Keyed Shaft For The Pulley. 1 Wire GM 130 Amp Chrome Alternator.If you changed your system from a 3 to 1 wire this is for you. Including All Items in the picture. Professional Installation Is Highly Recommended (No Instruction Included). We would greatly appreciate any and all pictures of this kit installed for other customers to view!