SBC short water pump vs long water pump and other questions - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-31-2004, 12:07 PM
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SBC short water pump vs long water pump and other questions

Well I'm going to be installing my new fan shroud soon on my ride, I noticed I currently have a Long water pump installed on my 400sbc. I can't tell right now if it's the clutch fan squealing or the pump so I was going to replace the long pump with a short one while I'm in there. I have a couple of questions
1) is the belt the same number for both pumps?
2) I know I'm going to need to replace the alternator bracket, but which style does it take? I've seen several different versions?
3) I want to replace the Radiator hoses while in there with either braided or? Any ideas
4) If I go to a 100 amp alt from a Pontiac, will the sbc style bracket work or is it a different style bracket?

Regards
Mark

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Old 03-31-2004, 02:07 PM
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From the looks of the picture of the engine in your gallery, I'd stay with whats on it now. The fan is half in and half out of the shroud, perfect!

Another Mark
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Old 03-31-2004, 02:31 PM
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Well, what you cannot see is the 1 inch gap between the shroud and the radiator. Also the 3 inch gap on each side of it. Since I live in a area that in the summers can top 100 degree mark I want to maximize the cooling of the 400 block.

Also the new shroud will allow me more room at the front of the engine, this will allow me more room to mount new tanks for windsheild and overflow. It will also allow me to get in to see my timing marks. I also will be removing the air pump and the extra plumbing that goes with it.

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Mark
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Old 04-01-2004, 07:27 AM
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To get max. benefit from the shroud, it needs to be as air tight to the radiator as passable. And like Jmark says the front 1/2 of the fan should be inside the shroud.

Alternator brackets for the short pump are all on the drivers side, and are hard to find. The 100 amp alternator for a chevy should fit. The pont alternator probably will if you key the case, done by taking the 4 long bolts out and turning the two case halves so the mounting holes line up.

If you change pumps just measure around the pulleys to get the length of the belt.

Troy

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Old 04-01-2004, 07:43 AM
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Don't forget about the crank pulley misalignment.

Why not keep the long pump and build you a shroud from aluminum?. Sounds easier to me. takes me around 30 min. to construct a shroud. You even get to make whatever notches and clearanced spots to hang stuff.
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Old 04-01-2004, 09:28 AM
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Quote:
Alternator brackets for the short pump are all on the drivers side
That's the kind of info I needed, I'll have to stick with the long pump then. I have the air conditioning compressor and the the power steering on the driver side now.

Quote:
Why not keep the long pump and build you a shroud from aluminum?.
That's what I'm building one out of, but I have to have a buddy do the bending because I don't have a large brake.

Thanks for the info, that's just what I needed to know.

Regards
Mark
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Old 04-01-2004, 01:25 PM
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ALUMINUM FAN SHROUD

J-B wil make you a real beautifull fan shroud out of billet aluminum.....

J & B MICROFINISH
PONTIAC ILL,

TEL---815-842-2279

IF THIS TURNS OUT TO BE THE WAY YOU WANT TO GO....

they are very talented and nice folks---and are making me a fan shroud next week.....

good luck

alaskan
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Old 04-01-2004, 11:23 PM
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Hold on a second Mark before you run out and buy a short pump. There are several differences. You will need short pump pulleys (on the pump and the crank). They are totally different than long pump pulleys. You can mount the alternator on any side you want, Though in stock form short pumps had drivers side mount and long pumps had passenger side mounts. If you can fabricate you can mount it where you want.

For the hassle if I were in your shoes I would stick with the long pump.

Oh yeah one more point there are actually three different pumps long, short and Corvette for small blocks, most people only know long and short. Just in case you get pulleys that won't line up. I am sure the guy at the parts store probably won't know there are three styles.

Royce
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Old 04-02-2004, 08:53 AM
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Thanks Royce, Yeah I think I'll stick with the long pump for now. At first when I thought about replacing it I didn't know all the in's and outs of what I was asking. Now I see after all the posts and looking at some pics of the 2 setups it will be a MAJOR deal. besides having to re hose the most of the front of the motor because of air conditioning, power steering etc. Oh well ya live and learn.

Now the only question is should I go for the stock or the high volume water pump?

Regards
Mark
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Old 04-02-2004, 09:29 AM
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In a stock application a stock pump will usually handle the task. If you upped the HP or think you will have cooling problems at all, go for a good high volume pump. The Edelbrock Vic pump is good along with the Stewart pumps. Those are two that I have used and have nothing but good things to say about them.

Royce
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