This is a brand new Edelbrock SB Chevy Victor Series Aluminum Water Pump, Short Style, Polished. 

E11-8820

Edelbrock Victor Series water pumps provide maximum cooling for the street and the race track. They're ideal to prevent overheating in street rods and street machines, as well as in tow rigs and motorhomes. Using state-of-the-art racing technology, Edelbrock has designed these "super cooling" water pumps to provide maximum flow, maximum pressure and equal distribution to both sides of the block within 1%. Available for most popular applications, these high-performance pumps flow in only one direction for optimum efficiency. The casting's computer-designed internal passages and CNC-machined cast iron impeller produce the maximum flow rate possible. Features include: aircraft industry clearances; heavy-duty 3/4" bearings and billet steel hubs. 

Short-Style Pump for most 1955-72 cars & trucks (5/8" pilot shaft)

Fits all 1955-68 S/B Chevy passenger cars, 1969-70 350 c.i.d. Corvettes and 1955-72 light duty trucks. Has 3/4" ball/ball bearing. Dimension from block surface to hub: 5-5/8". Inlet diameter: 1.80".