Difference between Short/Long H2O Pumps?
Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 2,487
Likes: 10
From: Palm Beach Florida
St. Jude Donor '12
Difference between Short/Long H2O Pumps?
What is the real difference? We are rebuiding my buddys 82. Converting it to a carb. He already has a new chrome long pump. But folks say you need new pullys to run it. He is not replacing the A/C. Just the steering pump, alt., and crank. As for the steering pump, there is NO room for that pully to move foward. I thought that the only pully he would need is the pully for the water pump itself. I was thinking the new pully has a deeper dish for it to go over the pump shaft. But im hearing conflicting stories.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
Actually, there are 3 SBC water pumps- short, long, and Corvette. The Corvette pump has the legs like the long one, but the snout (bearing length) of the short one. If you set all 3 on the bench the difference is obvious.
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
What is the real difference? We are rebuiding my buddys 82. Converting it to a carb. He already has a new chrome long pump. But folks say you need new pullys to run it. He is not replacing the A/C. Just the steering pump, alt., and crank. As for the steering pump, there is NO room for that pully to move foward. I thought that the only pully he would need is the pully for the water pump itself. I was thinking the new pully has a deeper dish for it to go over the pump shaft. But im hearing conflicting stories.
Scott
You just lost the game!!!
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
Actualy, the Corvette pump is a short pump with a longer shaft. The diameter of the shaft is also larger.
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
Chevy Water Pump Specifications
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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".
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Long-Style Pump for 1969-87 V8, 90° V6 & 1973-86 truck (5/8" pilot shaft)
• Fits all 1969-87 S/B Chevy or 90° V6 passenger cars and 1973-86 light duty trucks. Does not fit Corvettes (use #8810 or #8812) or late-model vehicles with serpentine accessory drive belts (use #8881). Has heavy-duty 3/4" ball/roller bearing.
• Dimension from block surface to hub: 6-15/16". Inlet diameter: 1.80".
------------------------------------------------------------
Short-Style Pump for 1971-82 Corvettes 3/4" pilot shaft)
• Fits all 1971-82 S/B Corvettes. Comes with heavy-duty 3/4" ball/roller bearing.
• Dimension from block surface to hub: 5-13/16". Inlet diameter: 1.80".
------------------------------------------------------------
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".
------------------------------------------------------------
Long-Style Pump for 1969-87 V8, 90° V6 & 1973-86 truck (5/8" pilot shaft)
• Fits all 1969-87 S/B Chevy or 90° V6 passenger cars and 1973-86 light duty trucks. Does not fit Corvettes (use #8810 or #8812) or late-model vehicles with serpentine accessory drive belts (use #8881). Has heavy-duty 3/4" ball/roller bearing.
• Dimension from block surface to hub: 6-15/16". Inlet diameter: 1.80".
------------------------------------------------------------
Short-Style Pump for 1971-82 Corvettes 3/4" pilot shaft)
• Fits all 1971-82 S/B Corvettes. Comes with heavy-duty 3/4" ball/roller bearing.
• Dimension from block surface to hub: 5-13/16". Inlet diameter: 1.80".
