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Generation III External Engine
LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories

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Old 03-03-2012, 07:28 PM   #1
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Default Which water pumps can be used on LS1? Either of these?

I'm doing an engine swap and running into a clearance issue with the big water pump pulley on the front of the LS1.

Can a waterpump from an LS3 or LS2 engine be used on the LS1? I'm considering this one:Click the image to open in full size.

Or this one:
Click the image to open in full size.

Or this one:
Click the image to open in full size.

Is there a reason why these wouldn't work on an LS1? They all say either LS2 or LS3 but aside from displacement, I'm not sure what the differences are. I REALLY need that 1.5-2" that that pulley takes up.

Thanks for the help.
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Old 03-04-2012, 01:17 AM   #2
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Pulley diameter is different
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Old 03-04-2012, 01:19 AM   #3
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If you have the ls2 pump with the "bell" pulley works fine, that's what I have in my car
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Old 03-04-2012, 01:38 AM   #4
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LS2 pump here, it is needed when using a FAST 102
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Old 03-04-2012, 02:07 AM   #5
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http://www.ebay.com/itm/LS3-WATER-PU...#ht_500wt_1202

Click the image to open in full size.

This is the one I'd like to buy. I want to use it as is, just bolt up and go. Is what's shown the "bell pulley" as mentioned earlier? The diameter looks the same as what came with my LS1. I just want to make sure the offset for the belt isn't different than the LS1.

Thanks
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Old 03-04-2012, 10:01 AM   #6
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Sorry read the op post wrong..
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Old 03-04-2012, 03:27 PM   #7
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I need one without the bell pulley. The bell pulley is what is creating my problem. It's just barely too deep. I need a water pump with a shaft that's about 1.5 inches shorter than the original.
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Old 03-04-2012, 03:29 PM   #8
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It sounds like I need an LS2 water pump like this one:
http://www.katechengines.com/street_...s/IMG_6963.JPG

Does that change the location of the belt?
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Old 03-04-2012, 06:11 PM   #9
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Have you looked into a corvette waterpump...I know the vettes have pullies that are different than the fbodies.
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Old 03-05-2012, 12:04 AM   #10
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Quote:
Originally Posted by trans_am7935 View Post
LS2 pump here, it is needed when using a FAST 102
Do you happen to know the part number for the ls2 pump you are using?
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Old 03-05-2012, 12:19 AM   #11
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The problem when changing water pumps is that all your other accs still line up. That's the hurdle.
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Old 03-05-2012, 06:37 AM   #12
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Any water pump will bolt up on any LS motor. The one in the photo looks like a corvette pump, it is shallower than the f body pump. It also moves the belt back about 3/4" so your crank pulley, alternator, PS, tensioner wont line up. You'll need to swap out the accessories for corvette or aftermarket (Kwik) spaced correctly.
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Old 06-22-2012, 03:21 AM   #13
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Is it possible just to replace the large bell pulley with a smaller more square shape as per the LS2/Vette pump ?

I'd like a smaller pulley on my LS1 pump as my blower belt touches the pump on occasion and gets eaten away, but must retain the same accessory belt position.
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Old 06-22-2012, 04:15 AM   #14
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To add...

With the bell type LS1 pump, can the pulley be removed ? If I could remove it, shorten it by about 1/2" and then refit, that would achieve what I need and the belt should still be fine.
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Old 06-22-2012, 06:57 AM   #15
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I've removed f body and truck pulleys to put a truck pulley on the f body pump. Never did a vette pully. You'll need a press or 3 jaw puller to get it off. When you press the new pulley on, take off the rear cover and support the shaft otherwise you'll just push the whole assembly into the back cover.
If you're putting a vette pulley on a f body pump, there may be ribs that interefere with the depth you can press it on.
Would the vette pump with 3/4" spacers solve your issue?
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Old 06-22-2012, 07:13 AM   #16
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Quote:
Originally Posted by garys 68 View Post
I've removed f body and truck pulleys to put a truck pulley on the f body pump. Never did a vette pully. You'll need a press or 3 jaw puller to get it off. When you press the new pulley on, take off the rear cover and support the shaft otherwise you'll just push the whole assembly into the back cover.
If you're putting a vette pulley on a f body pump, there may be ribs that interefere with the depth you can press it on.
Would the vette pump with 3/4" spacers solve your issue?
Thanks. I cannot space my pump, or any pump. It will foul my blower bracket. Already looked at that idea.

Dont suppose you have any photos of the rear of the large bell pulley ? Are pulleys available to buy separately ?

If the pulley was square like the Evans short option, it would be ideal.
Ive emailed Evans to see which pump may suit...I just dont like the idea of having to use a specific coolant.
Water is free and easy.

Another option would be the short pump aka LS2/vette etc and somehow extend the pulley forwards by 3/4" to reach the belt.
Or if a new or alternative pulley was available, install this to reach.
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Old 06-23-2012, 06:20 AM   #17
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Sorry, no pulley pics except for the one already mounted. Pulleys are not available separately. But leaky water pumps with pulleys are nearly free.
You can do what the 911 swap guys do and use a Mezerie remote electric pump and thermostat.
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Old 06-26-2012, 10:10 AM   #18
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Default LS4 pump?

This pump is quite the extreme but since we're on the subject. You have to route the belt kinda crazy, not sure if it helps. If you want to go this route, I happen to have a pump, but not the crank pulley to go with it.
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Which water pumps can be used on LS1? Either of these?-ls4-5.3l-v8-impala-ss.jpg  
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Old 06-26-2012, 08:56 PM   #19
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There are 2 things to watch for:
- alignment of the pulley plane with the other pulleys on the engine;
- thermostat type (1-piece, 2-piece);

to remedy the first, you have to change all the accessories;

to remedy the second, you get the other type of thermostat.
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Old 06-26-2012, 08:56 PM
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