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Old 10-21-2020, 10:17 AM   #26
msg
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Re: Is this the right water pump for an L31 Vortec with Vintage AC?

Thanks Geezer I am hopeful that this works. Is there a thermostat to look for that has the holes for this L31? Is the fail safe brand just a gimmick?
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Old 10-21-2020, 10:27 AM   #27
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Re: Is this the right water pump for an L31 Vortec with Vintage AC?

Use what you got!
Way down the road if you think you might have a problem then look into it.
Likely you won’t.
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Old 10-21-2020, 11:29 AM   #28
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Re: Is this the right water pump for an L31 Vortec with Vintage AC?

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Originally Posted by geezer#99 View Post
Do you know that some people don’t use a bypass on the intake like you have set up.
They rely on the normal heater hose routing to serve as a bypass.
Intake to bottom of heater core, top of core back to water pump is normal.
That's how mine is set up, works great just make sure your heater core isn't clogged up.
Oops, didn't see having ac, I don't have ac so not sure if it will work for you or not.
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Old 10-21-2020, 11:55 AM   #29
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Re: Is this the right water pump for an L31 Vortec with Vintage AC?

The water pump you have now comes back as fitting a 96 to 2000 350 and should be a reverse rotation pump. If it is a reverse rotation pump it will work with a serpentine belt set up but not v belts. The serpentine set up turns backwards compared to the v belt and requires a reverse rotation pump.
Someone mentioned just drill holes in the thermostat and skip the bypass all together. I tried that and it didn't work. It would seem to work at first but on a long drive on a hot day my temperature gauge would go crazy. It would be jumping all over. I put a bypass from the intake through my heater core back to the pump and it's been fine every since. If you don't want a heater you can just loop a hose from the intake to the water pump.
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Old 10-21-2020, 02:59 PM   #30
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Re: Is this the right water pump for an L31 Vortec with Vintage AC?

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The water pump you have now comes back as fitting a 96 to 2000 350 and should be a reverse rotation pump. If it is a reverse rotation pump it will work with a serpentine belt set up but not v belts. The serpentine set up turns backwards compared to the v belt and requires a reverse rotation pump.
Dangit! and thanks for telling me. Better to know now.

So when it says timing belt that means serpentine?
https://www.rockauto.com/en/moreinfo...0217&jsn=19498

How about this one, is this a fit? Im trying to be sure also to get the long pump since the vintage air and alan grove brackets I have are set up for that.
https://shop.advanceautoparts.com/p/...m=water%20pump
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Old 10-21-2020, 03:34 PM   #31
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Re: Is this the right water pump for an L31 Vortec with Vintage AC?

The pump I had before looks similar, it only has some stamped lettering that may not help ID what year/make this originally came off of. The garage that did the power steering conversion for me years back is closed down. They added this and the bracketry to the old 350 I had then.
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Old 10-21-2020, 03:57 PM   #32
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Re: Is this the right water pump for an L31 Vortec with Vintage AC?

I wonder if the reverse as you mention means the pulley mount would only go in one direction? That one spins either way so unless the propeller is designed in a curved style blade type way vs just straight out I wonder if it matters?
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Old 10-21-2020, 05:35 PM   #33
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Re: Is this the right water pump for an L31 Vortec with Vintage AC?

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I wonder if the reverse as you mention means the pulley mount would only go in one direction? That one spins either way so unless the propeller is designed in a curved style blade type way vs just straight out I wonder if it matters?
I may have misread your original post. The one in your link on the first post is a reverse rotation. Either will mount up and the pulley will turn as normal but the vanes in the reverse pump are different. All gen 1 350s flow the same direction but a serpentine belt turns the pump in the opposite direction. To keep the water flowing in the right direction the vanes are reversed in a reverse pump. Just make sure you don't have a reverse rotation pump and some type of a bypass. As long as it doesn't have a cutoff switch in the line the heater can serve as the bypass
I apologize if I mislead you in my earlier post. I thought you were saying the pump in your link was the pump on the motor.
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Old 10-21-2020, 06:15 PM   #34
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Re: Is this the right water pump for an L31 Vortec with Vintage AC?

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Originally Posted by garyd1961 View Post
I may have misread your original post. The one in your link on the first post is a reverse rotation. Either will mount up and the pulley will turn as normal but the vanes in the reverse pump are different. All gen 1 350s flow the same direction but a serpentine belt turns the pump in the opposite direction. To keep the water flowing in the right direction the vanes are reversed in a reverse pump. Just make sure you don't have a reverse rotation pump and some type of a bypass. As long as it doesn't have a cutoff switch in the line the heater can serve as the bypass
I apologize if I mislead you in my earlier post. I thought you were saying the pump in your link was the pump on the motor.
No worries Gary, I have been going all over the place and its hard to follow. That first link in post 1 was me trying to find a 2 port pump and this one here..

https://shop.advanceautoparts.com/p/...m=water%20pump

is the one thats one the motor now. It does say standard impeller rotation so I think its right?
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