Whats the difference between Long water pumps and short water pumps? - Chevy Nova Forum
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Old 16th-July-2007, 07:41 PM   #1
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Whats the difference between Long water pumps and short water pumps?

Whats the difference between Long water pumps and short water pumps?Just curious?Thanks bm
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Old 16th-July-2007, 07:48 PM   #2
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pumps

Just the length of the legs are different both work pretty much the same. The big block corvettes and camaros with limited room for ther fan and accessories make the short pump Ideal for the job. Chevelles and other A-body larger engine bays can use the long water pumps.

Tip long water pumps are more common and easier to find parts for. This seems to be a chevy thing short and long water pumps. buick olds and pontiac do not.

I am sure others will chime in with more info too. Good luck on the question. Jim
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Old 16th-July-2007, 07:49 PM   #3
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About 3/4 of an inch I believe, Doesn't sound like much untill you try and squeeze a long one in with dual electric fans., My short one clears about a 1/4 inch.
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Old 16th-July-2007, 08:26 PM   #4
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I learned the difference the HARD way. It cost me hundreds of dollars in car setup rework before I figured out how BIG the difference is.



As I measured, there's about 1.6" inches of difference between the height of the two pumps.
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Old 16th-July-2007, 08:38 PM   #5
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So why would someone buy a long water pump?Does it pump more?You would think someone would buy a short water pump just to be on the safe side?bm
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Old 16th-July-2007, 08:41 PM   #6
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So why would someone buy a long water pump?Does it pump more?You would think someone would buy a short water pump just to be on the safe side?bm
it is a matter of clearance and or bracket set ups. I don't think there is difference as far as flow rate.
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Old 16th-July-2007, 08:50 PM   #7
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Not only that, you will need to buy pulley's accordingly.
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Old 16th-July-2007, 09:01 PM   #8
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Bm, there are also different short pumps. Corvettes have a 3/4 shaft as opposed to the 5/8 shaft that pass cars got.Also I believe that the 'Vette one is 3/16 of an inch longer when measured from the bolt on face to the outside of the flange face.
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Old 16th-July-2007, 09:42 PM   #9
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Hey Bruce,
Someone may correct me, but I think they used short pumps on Corvettes and other tight clearance cars. Or maybe is was a year change over thing.....I can't remember.
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Old 16th-July-2007, 09:55 PM   #10
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they stopped using short water pumps in the 70's cars that came stock with short water pumps didn't have holes drilled in the heads to support an alternator bracket. i feel that the long water pump bracket and pulley set- ups are much stronger.
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Old 16th-July-2007, 10:21 PM   #11
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One advantage to the long pumps I learned as a teenager:

The alternator sits closer to the pump on the long pump. This makes the alternator belt shorter. At 6000 RPM, the shorter the distance between the pulleys, the less prone the belt is to leave you at the side of the road with the hood up re-installing it!!!

As they say.................................. ask me how I know
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Old 17th-July-2007, 12:14 AM   #12
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The short pumps were used until 68 and long pumps took over in 69 (for the BBC anyway). The 68 Nova was able to use a clutch fan but in 69 with a long water pump there was not enough room for the clutch. The short pump almost brushes against the timing cover on a BBC.

Tommy
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Old 17th-July-2007, 02:05 AM   #13
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The short pumps were used until 68 and long pumps took over in 69 (for the BBC anyway). The 68 Nova was able to use a clutch fan but in 69 with a long water pump there was not enough room for the clutch. The short pump almost brushes against the timing cover on a BBC.

Tommy
I think this is the same with the SBC as well...
My father's 70 came factory with a 307 and long pump.

From then on, pretty much everything up until the late early 90's had a long water pump. It seems to me, by browsing through catalogs and such, there are more parts available for the LWP setup rather than the short...though not by much.

IIRC, you can get spacers to make a swp fit correctly in a lwp application (just makes the "legs" of the short pump longer so the pulleys line up).
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Old 17th-July-2007, 02:10 PM   #14
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Long water pump set ups are commonly used on trucks as well.
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Old 17th-July-2007, 03:09 PM   #15
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Quote:
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IIRC, you can get spacers to make a swp fit correctly in a lwp application (just makes the "legs" of the short pump longer so the pulleys line up).
You can get spacers, but the short pump doesn't have the mounting points for the common alternator plates.
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