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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old May 2nd, 2023, 12:06 AM
Sabesimpson Sabesimpson is offline
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Default Thermostat housing / water outlet

Hi all!
So I’ve tried everything to get this housing. Tried all the parts stores, even ordered the “77-81 trans-am 4.9L” housing.
Anyone here have a good part number?
This $20 part is the hold up.

Every one I got the bolt pattern was to wide.

Thanks for the help!!
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  #2  
Old May 4th, 2023, 07:39 PM
BobBray BobBray is offline
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Default Re: Thermostat housing / water outlet

The Pontiac housing fits 351's with the thermostat on the front of the water crossover. A 1965 should have a crossover with the thermostat on top. Does your truck use a thermostat housing with a vertical outlet or a horizontal outlet?
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  #3  
Old May 4th, 2023, 10:13 PM
jerrspud jerrspud is offline
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Default Re: Thermostat housing / water outlet

oh dang. So a normal SBC water outlet doesn't fit?
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  #4  
Old May 5th, 2023, 01:32 PM
Sabesimpson Sabesimpson is offline
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Default Re: Thermostat housing / water outlet

Correct it is aluminum horizontal
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  #5  
Old May 5th, 2023, 01:37 PM
Sabesimpson Sabesimpson is offline
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Default Re: Thermostat housing / water outlet

Small block Chevy does not fit it is to large. Bolt pattern is off by about 1/4” on each. And the gasket is to large to hold the t-stat in place.
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Old May 5th, 2023, 01:57 PM
James James is offline
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Default Re: Thermostat housing / water outlet

I had the same problem with my thermostat housing. I had repaired it with Devcon 10760 Gray Titanium Putty, 1 lb. Can. Be sure to bead blast the housing before using it. It is the most chemical and temperature resistance version they make.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I just realized the price of that stuff really went up.

I included a before and after pictures of my housing.
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  #7  
Old May 5th, 2023, 05:23 PM
BobBray BobBray is offline
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Default Re: Thermostat housing / water outlet

Can you tell me what the distance is between the bolts? Center to center.
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Old May 5th, 2023, 05:31 PM
James James is offline
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Default Re: Thermostat housing / water outlet

Quote:
Originally Posted by bobbray View Post
can you tell me what the distance is between the bolts? Center to center.
3" c-c.
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  #9  
Old May 5th, 2023, 09:30 PM
BobBray BobBray is offline
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Default Re: Thermostat housing / water outlet

I found this one for an older Pontiac, but the outlet is more vertical:

https://www.rockauto.com/en/moreinfo...10337&jsn=1638
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  #10  
Old May 6th, 2023, 01:58 PM
Sabesimpson Sabesimpson is offline
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Default Re: Thermostat housing / water outlet

Correct 3” on center
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