Short water pump vs. long? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

KAILUAZ · 03-12-2007, 09:44 AM

Ok, so I the PO put a long water pump on the 350 but left the short pump accessory brackets. I now have a mismatch of short and long brackets and the power steering pump is not aligned right (you can see the spacers the PO made).
I also got rid of the stock A/C and want to change the pulleys.
Should I get a short water pump or change all the brackets for the long pump? Thanks.

Fred T · 03-12-2007, 05:58 PM

I made the mistake of putting a long pump on my 69. Getting the right brackets is a real pain. To get the power steering right, you need a pump, bracket and pulley from a 73 & on. If I had it to do over I would put on the short pump.

I did get my original ps pump to work, but I cannot run AC with the setup. I turned the pulley around and milled the hub nipple down until the belt lined up.

KAILUAZ · 03-12-2007, 11:39 PM

Cool, that was what I was looking for. I'll just switch to a short pump, thanks for the help.

RACINJASON22 · 03-13-2007, 12:33 AM

KAILUAZ IMO your making the right choice. Since you have that pump. It would seem to me that the newer long water pump brakets are easier to find because they are simply newer but, the old ones are out there and thats what your truck should have on it anyway. Good Luck with the parts seach. RJ22

cableguy0 · 03-13-2007, 07:42 AM

you have the passenger side alternator bracket which is setup for a long pump. you will have to find the drivers side alternator bracket and the correct water pump pulley in order to use a short water pump.it also looks like you have the factory crank pulley though and that the alternator is getting slowly eaten up by it.basically at this point you might as well flip a coin to make a decision because you have so much mismatched stuff. either way its going to be a pita unless you find a complete bracket set

KAILUAZ · 03-13-2007, 09:06 AM

Yeah this is a major PITA!! Thanks for the recommendations.

KAILUAZ · 03-13-2007, 05:48 PM

So I will need the driver side alt mounting brackets and short water pump and new pulley. I should then be able to use the stock crank pulley and current alt/p.s. pulleys? I can then use stock belts?
Someone have a pic of the stock setup with headers?
Thanks.

Duro5341 · 03-14-2007, 04:34 PM

Just look at the timing cover....if it's really tight ti the water pump then you have a short neck. If it's about 1" from the timing cover then it's the long neck.

Most trucks got the long neck from factory, and the corvettes and sports cars where the short neck for clearence issues

Duro

**Captainfab** · 03-14-2007, 11:41 PM

I didn't have a swp small block to set this up on so I just took a couple of pics to show you what the original alternater brackets look like for your 70 GMC. This is to the best of my knowledge what you should have with a short water pump.

KAILUAZ · 03-15-2007, 09:59 AM

Quote:

Originally Posted by Captainfab

I didn't have a swp small block to set this up on so I just took a couple of pics to show you what the original alternater brackets look like for your 70 GMC. This is to the best of my knowledge what you should have with a short water pump.

Cool, thanks for doing that, this board is great! You

LovesickOutlaw · 02-01-2010, 09:19 AM

Now im doing the opposite and having clearance issues with tall valve covers with having the altenator on the drivers side. But to switch pulleys over to the newer style set up i have to change over to long neck pump, will this cause radiator to fan clearance issues???

03-12-2007, 09:44 AM	#1
KAILUAZ King of Rust Join Date: Jul 2005 Location: St Petersburg, FL Posts: 359	Short water pump vs. long? Ok, so I the PO put a long water pump on the 350 but left the short pump accessory brackets. I now have a mismatch of short and long brackets and the power steering pump is not aligned right (you can see the spacers the PO made). I also got rid of the stock A/C and want to change the pulleys. Should I get a short water pump or change all the brackets for the long pump? Thanks. __________________ 1970 GMC 2500, 350, TH400, front disks, thats it! My Pics Last edited by KAILUAZ; 03-12-2007 at 09:45 AM.

03-12-2007, 05:58 PM	#2
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Re: Short water pump vs. long? I made the mistake of putting a long pump on my 69. Getting the right brackets is a real pain. To get the power steering right, you need a pump, bracket and pulley from a 73 & on. If I had it to do over I would put on the short pump. I did get my original ps pump to work, but I cannot run AC with the setup. I turned the pulley around and milled the hub nipple down until the belt lined up. Attached Images __________________ Fred There is no such thing as too much cam...just not enough engine.

03-12-2007, 11:39 PM	#3
KAILUAZ King of Rust Join Date: Jul 2005 Location: St Petersburg, FL Posts: 359	Re: Short water pump vs. long? Cool, that was what I was looking for. I'll just switch to a short pump, thanks for the help. __________________ 1970 GMC 2500, 350, TH400, front disks, thats it! My Pics

03-13-2007, 12:33 AM	#4
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: Short water pump vs. long? KAILUAZ IMO your making the right choice. Since you have that pump. It would seem to me that the newer long water pump brakets are easier to find because they are simply newer but, the old ones are out there and thats what your truck should have on it anyway. Good Luck with the parts seach. RJ22 __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR! Last edited by RACINJASON22; 03-13-2007 at 12:33 AM.

03-13-2007, 07:42 AM	#5
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: Short water pump vs. long? you have the passenger side alternator bracket which is setup for a long pump. you will have to find the drivers side alternator bracket and the correct water pump pulley in order to use a short water pump.it also looks like you have the factory crank pulley though and that the alternator is getting slowly eaten up by it.basically at this point you might as well flip a coin to make a decision because you have so much mismatched stuff. either way its going to be a pita unless you find a complete bracket set __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. Last edited by cableguy0; 03-13-2007 at 07:45 AM.

03-13-2007, 09:06 AM	#6
KAILUAZ King of Rust Join Date: Jul 2005 Location: St Petersburg, FL Posts: 359	Re: Short water pump vs. long? Yeah this is a major PITA!! Thanks for the recommendations. __________________ 1970 GMC 2500, 350, TH400, front disks, thats it! My Pics

03-13-2007, 05:48 PM	#7
KAILUAZ King of Rust Join Date: Jul 2005 Location: St Petersburg, FL Posts: 359	Re: Short water pump vs. long? So I will need the driver side alt mounting brackets and short water pump and new pulley. I should then be able to use the stock crank pulley and current alt/p.s. pulleys? I can then use stock belts? Someone have a pic of the stock setup with headers? Thanks. __________________ 1970 GMC 2500, 350, TH400, front disks, thats it! My Pics Last edited by KAILUAZ; 03-13-2007 at 05:49 PM.

03-14-2007, 04:34 PM	#8
Duro5341 Registered User Join Date: Dec 2006 Location: Earth Posts: 239	Re: Short water pump vs. long? Just look at the timing cover....if it's really tight ti the water pump then you have a short neck. If it's about 1" from the timing cover then it's the long neck. Most trucks got the long neck from factory, and the corvettes and sports cars where the short neck for clearence issues Duro

03-14-2007, 11:41 PM	#9
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: Short water pump vs. long? I didn't have a swp small block to set this up on so I just took a couple of pics to show you what the original alternater brackets look like for your 70 GMC. This is to the best of my knowledge what you should have with a short water pump. Attached Images

02-01-2010, 09:19 AM	#11
LovesickOutlaw Registered User Join Date: Apr 2009 Location: Rochester, Washington Posts: 1	Re: Short water pump vs. long? Now im doing the opposite and having clearance issues with tall valve covers with having the altenator on the drivers side. But to switch pulleys over to the newer style set up i have to change over to long neck pump, will this cause radiator to fan clearance issues???



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