Water Pump
Thread Starter
Intermediate
Joined: Apr 2008
Posts: 26
Likes: 0
Water Pump
I'm getting ready to drop in a new crate motor in a 1979 and I am confused on what what water pump to use . Does it have to be corvette specific,or can I use a short pump with a shim kit behind the pulley? Also does this water pump run counter clockwise or clockwise I've been told both. That's why I figured I better check on this forum, you guys have been the best source of information since I started this project. thanks
Drifting
Joined: Jul 2005
Posts: 1,562
Likes: 2
From: Spring Texas
Get the Corvette specific water pump. It willl be one less thing to worry about and one less thing to cause the next owner to cuss at you when he starts working on it. The pump should be standard rotation if you are using all the original pulleys and brackets. If you are using a serpentine system, you will need to verify whether the setup is for reverse rotation or standard.
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
I agree with the above. Get a Corvette specific pump for your year so you don't have to shim a pulley. That's just inviting run out and vibration problems.
At the same time, you want a clockwise rotation pump, which is standard rotation for your Vette. Reverse rotation, or counter clockwise, was not started until GM started putting serpentine belt systems on engines.
At the same time, you want a clockwise rotation pump, which is standard rotation for your Vette. Reverse rotation, or counter clockwise, was not started until GM started putting serpentine belt systems on engines.
Safety Car
Joined: Oct 2007
Posts: 3,729
Likes: 267
From: Austin Texas
Corvette of the Year Winner 2017
2016 C3 of Year Finalist
Corvette water Pump only ??
Anyone have these specs. for a corvete pump only ?
I used a standard "Short pump" High volume,
I used all orginal pulley and brackets, no shimming required.
just fired up my motor no belt aligment issues.
good luck...69VETT
I used a standard "Short pump" High volume,
I used all orginal pulley and brackets, no shimming required.
just fired up my motor no belt aligment issues.
good luck...69VETT
Instructor
Joined: Sep 2006
Posts: 211
Likes: 0
From: Searcy Arkansas
Hate to sound like a dumb-dumb but "Corvette specific" water pump? I guess I did not know that when I put my 350 in...The belts do not line up perfectly and there is some vibration in the alternator bracket when running. I guess I thought it was just something I would have to live with...
I have been intending to change out the pump anyway because it is not the shiny chrome one but have also been thinking about an electric pump... Has anyone had any experience with the electrics? & Does anyone have a part number or affordable place to buy on a "Specific" conventional chrome pump for a 78 w/350?
Thanks!
I have been intending to change out the pump anyway because it is not the shiny chrome one but have also been thinking about an electric pump... Has anyone had any experience with the electrics? & Does anyone have a part number or affordable place to buy on a "Specific" conventional chrome pump for a 78 w/350?
Thanks!
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Hate to sound like a dumb-dumb but "Corvette specific" water pump? I guess I did not know that when I put my 350 in...The belts do not line up perfectly and there is some vibration in the alternator bracket when running. I guess I thought it was just something I would have to live with...
I have been intending to change out the pump anyway because it is not the shiny chrome one but have also been thinking about an electric pump... Has anyone had any experience with the electrics? & Does anyone have a part number or affordable place to buy on a "Specific" conventional chrome pump for a 78 w/350?
Thanks!
I have been intending to change out the pump anyway because it is not the shiny chrome one but have also been thinking about an electric pump... Has anyone had any experience with the electrics? & Does anyone have a part number or affordable place to buy on a "Specific" conventional chrome pump for a 78 w/350?
Thanks!
Yeah, GM makes four water pumps for Gen1 small block engines.
Long - Clockwise
Short - Clockwise
Corvette short - Clockwise
Long - Counter Clockwise
You probably got a GM short pump, which is just a bit different than Corvette specific water pumps.
Here is a Corvette specific chrome water pump from Eckler's.
http://www.ecklers.com/product.asp?p...4&dept_id=1220
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Le Mans Master
Joined: Sep 2001
Posts: 7,739
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From: Unreconstructed, South Carolina
FYI ... V belt pumps rotate same as crank ... serpentine pumps typically reverse.
vette pump (~ 5.795") about 3/16" larger from block to hub face than short (~ 5.625")
Last edited by jackson; Jun 30, 2008 at 03:39 PM.
Safety Car
Joined: Oct 2007
Posts: 3,729
Likes: 267
From: Austin Texas
Corvette of the Year Winner 2017
2016 C3 of Year Finalist
great info ! thanks !
Great info ! thanks !
and... that explains why I was able to use a standard pump on my 69 configuration. 69VETT
and... that explains why I was able to use a standard pump on my 69 configuration. 69VETT
Advanced
Joined: Mar 2007
Posts: 91
Likes: 0
From: London, UK
I used the GM Performance 14011012 aluminum pump. Direct fit on my 79 and the pulley didn't need any shims. Also had 2 bolt paterns for different types of pulley. You need the clockwise pump for a standard setup or a reverse rotation if you have a serpentine belt conversion.
Hope this helps
Hope this helps
Advanced
Joined: Mar 2007
Posts: 91
Likes: 0
From: London, UK
I used the GM Performance 14011012 aluminum pump. Direct fit on my 79 and the pulley didn't need any shims. Also had 2 bolt paterns for different types of pulley. You need the clockwise pump for a standard setup or a reverse rotation if you have a serpentine belt conversion.
Hope this helps
Hope this helps
Instructor
Joined: Sep 2006
Posts: 211
Likes: 0
From: Searcy Arkansas
Yeah, GM makes four water pumps for Gen1 small block engines.
Long - Clockwise
Short - Clockwise
Corvette short - Clockwise
Long - Counter Clockwise
You probably got a GM short pump, which is just a bit different than Corvette specific water pumps.
Here is a Corvette specific chrome water pump from Eckler's.
http://www.ecklers.com/product.asp?p...4&dept_id=1220
Long - Clockwise
Short - Clockwise
Corvette short - Clockwise
Long - Counter Clockwise
You probably got a GM short pump, which is just a bit different than Corvette specific water pumps.
Here is a Corvette specific chrome water pump from Eckler's.
http://www.ecklers.com/product.asp?p...4&dept_id=1220
Thanks for the info! I'll take a look...
Drifting
Joined: Apr 2007
Posts: 1,970
Likes: 45
From: Cameron Park CA
Still confused, but that's normal...
This is all very interesting!!! When I built my engine, I used aluminum pump p/n 14011012 that lil_red_devil says is superseded. I just punched 14011012 into GMPartsDirect's web pagehttp://www.gmpartsdirect.com/ and it comes still comes up.
In any event, that's not why I am posting here. My car is a very late (Nov.'69) can and i found the above pump placed the w/p pulley and fan 3/16" too far forward! To align the belts, I made this plate that fits between the harmonic balancer and the crank pulley.
(that is supposed to be an image, not just a link???)
This aligned the crank and w/p pulleys. I only have an alternator to accomodate, and that was easy with the Hooker alternator adapter I bought with the headers.
I'm still confused about short and Corvette short pumps, but that's how I got around the problem.
Cheers,
Pete
In any event, that's not why I am posting here. My car is a very late (Nov.'69) can and i found the above pump placed the w/p pulley and fan 3/16" too far forward! To align the belts, I made this plate that fits between the harmonic balancer and the crank pulley.
(that is supposed to be an image, not just a link???)This aligned the crank and w/p pulleys. I only have an alternator to accomodate, and that was easy with the Hooker alternator adapter I bought with the headers.
I'm still confused about short and Corvette short pumps, but that's how I got around the problem.
Cheers,
Pete
Advanced
Joined: Mar 2007
Posts: 91
Likes: 0
From: London, UK
This is all very interesting!!! When I built my engine, I used aluminum pump p/n 14011012 that lil_red_devil says is superseded. I just punched 14011012 into GMPartsDirect's web pagehttp://www.gmpartsdirect.com/ and it comes still comes up.
In any event, that's not why I am posting here. My car is a very late (Nov.'69) can and i found the above pump placed the w/p pulley and fan 3/16" too far forward! To align the belts, I made this plate that fits between the harmonic balancer and the crank pulley.
(that is supposed to be an image, not just a link???)
This aligned the crank and w/p pulleys. I only have an alternator to accomodate, and that was easy with the Hooker alternator adapter I bought with the headers.
I'm still confused about short and Corvette short pumps, but that's how I got around the problem.
Cheers,
Pete
In any event, that's not why I am posting here. My car is a very late (Nov.'69) can and i found the above pump placed the w/p pulley and fan 3/16" too far forward! To align the belts, I made this plate that fits between the harmonic balancer and the crank pulley.
(that is supposed to be an image, not just a link???)This aligned the crank and w/p pulleys. I only have an alternator to accomodate, and that was easy with the Hooker alternator adapter I bought with the headers.
I'm still confused about short and Corvette short pumps, but that's how I got around the problem.
Cheers,
Pete
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
The only time that I'd use a Corvette specific pump would be on a all original NCRS car.. However, there's no real reason to go with a Corvette water pump on any other street Vette or Hotrod. You can get a high volume aluminum pump for $50, less than half the price of the iron pump that is Corvette specific..
I have a ProComp high volume pump on my yellow '68 and i'm running 170 to 190 degrees.. No alignment issues with the belt..
I have a ProComp high volume pump on my yellow '68 and i'm running 170 to 190 degrees.. No alignment issues with the belt..
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
This is all very interesting!!! When I built my engine, I used aluminum pump p/n 14011012 that lil_red_devil says is superseded. I just punched 14011012 into GMPartsDirect's web pagehttp://www.gmpartsdirect.com/ and it comes still comes up.
In any event, that's not why I am posting here. My car is a very late (Nov.'69) can and i found the above pump placed the w/p pulley and fan 3/16" too far forward! To align the belts, I made this plate that fits between the harmonic balancer and the crank pulley.
(that is supposed to be an image, not just a link???)
This aligned the crank and w/p pulleys. I only have an alternator to accomodate, and that was easy with the Hooker alternator adapter I bought with the headers.
I'm still confused about short and Corvette short pumps, but that's how I got around the problem.
Cheers,
Pete
In any event, that's not why I am posting here. My car is a very late (Nov.'69) can and i found the above pump placed the w/p pulley and fan 3/16" too far forward! To align the belts, I made this plate that fits between the harmonic balancer and the crank pulley.
(that is supposed to be an image, not just a link???)This aligned the crank and w/p pulleys. I only have an alternator to accomodate, and that was easy with the Hooker alternator adapter I bought with the headers.
I'm still confused about short and Corvette short pumps, but that's how I got around the problem.
Cheers,
Pete
Normal rotation pumps for Corvette SB
From the pump mounting surface to the pulley mounting surface
Up to 70---5.625"----5/8" shaft
Up to 70---5.625"----3/4" shaft
71-82---5.795"----3/4" shaft
Long SB pump is 6.932"
Some pass cars and trucks also used both the 5/8" and 3/4" shaft short pumps.
Drifting
Joined: Apr 2007
Posts: 1,970
Likes: 45
From: Cameron Park CA
Normal rotation pumps for Corvette SB
From the pump mounting surface to the pulley mounting surface
Up to 70---5.625"----5/8" shaft
Up to 70---5.625"----3/4" shaft
71-82---5.795"----3/4" shaft
Long SB pump is 6.932"
Some pass cars and trucks also used both the 5/8" and 3/4" shaft short pumps.
From the pump mounting surface to the pulley mounting surface
Up to 70---5.625"----5/8" shaft
Up to 70---5.625"----3/4" shaft
71-82---5.795"----3/4" shaft
Long SB pump is 6.932"
Some pass cars and trucks also used both the 5/8" and 3/4" shaft short pumps.
That makes sense. 5.795" - 5.652" = .17". My spacer at 3/16" = .1875. The pump I am using, p/n 14011012, is the longer short Corvette pump, and my crank pulley is for the shorter short Corvette pump since it's a 1969 model. My 3/16" spacer is off by 0.0175 or about 1/64", but it doesn't seem to be enough to bother the belts. The key was getting the alternator aligned properly which I was able to do.
Cheers,
Pete
