• 1955-68 Short Design Design, 5/8" Shaft
• Aluminum construction
• Reinforced housing for extra strength
• Lightweight, low drag impeller adds 14HP @ 7,500 RPM
• Includes integral cam stop boss
• Overall length of 5.603" from rear mounting face to hub face
• Spacer Kit No. 63510 converts this 63500 pump to '69-later "long" design