ls3 waterpump not the same as ls6-ls1 pump
Thread Starter
Burning Brakes
Joined: Feb 2007
Posts: 1,015
Likes: 1
From: Eagle Rock Missouri
ls3 waterpump not the same as ls6-ls1 pump
I bought a new ls3 waterpump and about the only thing the same about these 2 pumps are bolt pattern to block and the heater hose inlet. The waterpump inlet is bigger in diameter and deeper. Takes a different thermostate than the ls1 or the ls2. It is much larger. Outlet is in a different location. The pulley is a lot shollower and lighter. The tensioner location is slightly at a different angle. I'm going to adapt it to my ls6. The design looks like it will flow a lot more fluid. The flow lines are close to straight and not severely angled like the ls6
Burning Brakes
Joined: Aug 2007
Posts: 831
Likes: 2
From: Houston Texas
If they are interchangeable with the LS6 WP, could you list the GM Part Numbers? Is any one of the pumps superior to another?
Thanks
Last edited by NatB; Jul 7, 2014 at 02:01 PM.
Thread Starter
Burning Brakes
Joined: Feb 2007
Posts: 1,015
Likes: 1
From: Eagle Rock Missouri
Yes mine is the center one, it's going to work just got to get a shorter hose and a different thermo stat, the pulley is the corvette one. Mine came from a new ls3 crate motor
Le Mans Master
Joined: Dec 2005
Posts: 8,475
Likes: 332
From: Port Arthur, Texas 77642
It would seem the top pump labeled LS3/LS7 would be less likely to cavitate with the 7k redline of the LS7 engine. I don't know if the LS6 (6500 redline) or LS1 (6000 redline) cavitate, just an observation.
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Burning Brakes
Joined: Jun 2007
Posts: 963
Likes: 72
The LS3 pulley is significantly shorter than the the LS1 from front to back.
Burning Brakes
Joined: Aug 2007
Posts: 831
Likes: 2
From: Houston Texas
Safety Car
Joined: Jul 2004
Posts: 3,904
Likes: 28
From: Vancouver Washington
You're looking at the inlet of one and outlet of the other. The LS1/6 pump and the LS7 pump have inlets and outlets in similar locations and angles. One advantage of the LS7 over the LS6 is that you can fit a 92 or 102mm throttle body on a FAST manifold without any grinding on the pump.
Drifting
Joined: Nov 2014
Posts: 1,969
Likes: 108
From: Switzerland
i have to replace the water pump on my 99 c5. is this what i should get (2010 ls7)?
https://www.rockauto.com/catalog/mor...nid=498&jpid=3
will the centri blower line up correctly?
https://www.rockauto.com/catalog/mor...nid=498&jpid=3
will the centri blower line up correctly?
Last edited by romandian; Dec 18, 2015 at 12:22 PM.
