Help Identify Water Pump / Thermostat Housing
#1
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So I have a waterpump which I believe to be a LS2 Pump on my LSX race motor (Came with original motor dont ask lol). I am looking at swapping my Tstat to a lower temp one but to my dismay I see what looks like a motorad tstat thats for an LS1 on the pump.
Could the pump be a replacement LS1 Pump or is it an LS2? It clears my FAST 102 and NW 102 TB. Just curious what you think.
And yes I cant see the numbers on it hence why Im asking![Happy](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_stretch.gif)
Thanks!
Could the pump be a replacement LS1 Pump or is it an LS2? It clears my FAST 102 and NW 102 TB. Just curious what you think.
And yes I cant see the numbers on it hence why Im asking
![Happy](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_stretch.gif)
Thanks!
#2
TECH Senior Member
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Pic shows an LS1 thermostat housing (has cast post for supporting subharness) which only fits in an LS1 pump (wings holding thermostat are too wide to fit in LS2/LS3 pump).
#6
TECH Senior Member
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Both LS1 and LS2 pumps have removable TS housing....!?!
The LS1 housing+thermostat is 1-piece and does not physically fit into an LS2 pump because the tabs are too wide... so by elimination that must be an LS1 pump.
The LS2 housing+thermostat is 2 piece (does not have the 2 tabs to contain the TS).
The LS1 housing+thermostat is 1-piece and does not physically fit into an LS2 pump because the tabs are too wide... so by elimination that must be an LS1 pump.
The LS2 housing+thermostat is 2 piece (does not have the 2 tabs to contain the TS).
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#9
TECH Fanatic
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Both LS1 and LS2 pumps have removable TS housing....!?!
The LS1 housing+thermostat is 1-piece and does not physically fit into an LS2 pump because the tabs are too wide... so by elimination that must be an LS1 pump.
The LS2 housing+thermostat is 2 piece (does not have the 2 tabs to contain the TS).
The LS1 housing+thermostat is 1-piece and does not physically fit into an LS2 pump because the tabs are too wide... so by elimination that must be an LS1 pump.
The LS2 housing+thermostat is 2 piece (does not have the 2 tabs to contain the TS).
#11
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#12
TECH Senior Member
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The thermostat in the pic in post #1 above is the thermostat on the left in this pic:
![](http://rpmspeed.com/images/thermostat.JPG)
the housing tabs that hold the thermostat element are too wide to fit into the LS2/LS3 pump... so this 1-piece thermostat only fits into the LS1 pump.
the housing tabs that hold the thermostat element are too wide to fit into the LS2/LS3 pump... so this 1-piece thermostat only fits into the LS1 pump.
#13
TECH Senior Member
#16
TECH Senior Member
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Yes... but you need one with the correct pulley to match the car (F-car or Y-car)...
(or to put it in other words: no, you need specifically an LS1 pump, not an LS2 nor LS3 pump)
any replacement LS1 pump you can buy in the last 6 years has the correct pulley but takes the LS2 TS.
(or to put it in other words: no, you need specifically an LS1 pump, not an LS2 nor LS3 pump)
any replacement LS1 pump you can buy in the last 6 years has the correct pulley but takes the LS2 TS.
#17
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About two or three weeks ago a got a new ac delco ls2 pump that could take an ls1 or ls2 thermostat. It came with an ls2 thermostat, but I ended up using my old 160 degree ls1 thermostat. Inside the box there was a paper saying that either thermostat would work but I just had to use the correct gasket.