The Vettes all use short pumps.
Which water pump is correct?
Thread Starter
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Joined: Jun 2006
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From: Iowa
Which water pump is correct?
I have just pulled the 350 (original block) from my 1973 base coupe and it has a short water pump. Is this correct? I was under the impression it should be the long version.
Just wondering as I embark on the journey to rebuild this engine.
Thanks
Just wondering as I embark on the journey to rebuild this engine.
Thanks
Drifting
Joined: Jan 2001
Posts: 1,841
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From: Halifax, NS, Canada
Originally Posted by Hogzilla
I have just pulled the 350 (original block) from my 1973 base coupe and it has a short water pump. Is this correct? I was under the impression it should be the long version.
Just wondering as I embark on the journey to rebuild this engine.
Thanks
Just wondering as I embark on the journey to rebuild this engine.
Thanks
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
The reason is pretty simple too just in case you wonder. In a Vette where the rad is at such a rake, they have to keep the upper edge of the supprt from hitting the factory fan. A long pump can be used but with a fan on it it would hit the support. I have a long pump going in my Vette but I'm switching to an electric, and without the factory fan there is room for the longer pump.
Drifting
Joined: Dec 2004
Posts: 1,714
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From: Austin Texas
If I remember correctly, the Vette pump uses a larger shaft than the standard passenger car water pump also. not a big deal but thought it might be worth mentioning. just another way that Vettes are special.
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Joined: Jun 2006
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From: Iowa
Thanks guys. I'm not sure why I thought long was correct. I'm new to the vette scene, so I have a lot to learn. Last week I pulled the engine and this week I am pulling the trans, for a little winter fun.
Team Owner
Joined: Aug 2006
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From: Columbia Missouri
Originally Posted by johnt365
If I remember correctly, the Vette pump uses a larger shaft than the standard passenger car water pump also. not a big deal but thought it might be worth mentioning. just another way that Vettes are special.
Do you mean larger as in diameter or length? The Vette uses a very short shaft, compared to other GM cars that have more room for the fan and clutch.
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Burning Brakes
Joined: Jul 2006
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From: SoCal
Larger diameter. I think other pumps have 5/8" diameter shafts but the Vette uses a 3/4" shaft. Don't quote me on this 'cause I'm going from memory - but I do remember having to drill a larger diameter hole in an off-the-shelf aluminum water pulley a couple of years ago.
Team Owner
Joined: Aug 2006
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From: Columbia Missouri
Originally Posted by VCuomo
Larger diameter. I think other pumps have 5/8" diameter shafts but the Vette uses a 3/4" shaft. Don't quote me on this 'cause I'm going from memory - but I do remember having to drill a larger diameter hole in an off-the-shelf aluminum water pulley a couple of years ago.
I think the diameter change was based more on year than model pump. I don't know either but am sure I remember hearing that.
Burning Brakes
Joined: Jul 2006
Posts: 1,047
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From: SoCal
Looks like you are correct Durango Boy. I did a little research on the Edelbrock website, and '69 - '70 Corvettes use a "short-style" water pump with a 5/8" shaft, and '71 - '91 use a short-style pump with a 3/4" shaft (although '71 - '82 use a different inlet diameter and block surface to hub length than '84 - '91).
They don't mention what water pump is correct for a '68.
They don't mention what water pump is correct for a '68.
Team Owner
Joined: Aug 2006
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From: Columbia Missouri
Originally Posted by VCuomo
Looks like you are correct Durango Boy. I did a little research on the Edelbrock website, and '69 - '70 Corvettes use a "short-style" water pump with a 5/8" shaft, and '71 - '91 use a short-style pump with a 3/4" shaft (although '71 - '82 use a different inlet diameter and block surface to hub length than '84 - '91).
They don't mention what water pump is correct for a '68.
They don't mention what water pump is correct for a '68.
I would think the short from a '70, '71 would work fine with an early C3. I have never swapped oneof those fans around, but a later year fan wouldn't hurt the originality of the car...at least I wouldn't think so.