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| GMC V6 and V12 Engines Engine repair and rebuilding |
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#1
May 2nd, 2023, 12:06 AM
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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
May 4th, 2023, 07:39 PM
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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
May 4th, 2023, 10:13 PM
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Re: Thermostat housing / water outlet
oh dang. So a normal SBC water outlet doesn't fit?
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#4
May 5th, 2023, 01:32 PM
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Re: Thermostat housing / water outlet
Correct it is aluminum horizontal
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#5
May 5th, 2023, 01:37 PM
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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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#6
May 5th, 2023, 01:57 PM
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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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#8
May 5th, 2023, 05:31 PM
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Re: Thermostat housing / water outlet
Quote:
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#9
May 5th, 2023, 09:30 PM
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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
May 6th, 2023, 01:58 PM
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Re: Thermostat housing / water outlet
Correct 3” on center
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