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Old 07-02-2010, 06:53 PM
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thermosat housings

What years and vehicles thermosat housings are compatible with a 1981 305 engine.Thanks all in advance.
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Old 07-02-2010, 07:10 PM
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Most Chevy thermostat housings exit toward the drivers side where the top rad hose goes into the rad, yours included, I am sure.........Some went straight up toward the centre, but those are less common.......

Some of the housings had spots for emissions fittings
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Old 07-02-2010, 07:29 PM
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tks Poncho,mine is just the upper hose to the housing,fitting on a performer intake all 350 or 305 with one inlet should be the same?
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Old 07-02-2010, 11:46 PM
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Quote:
Originally Posted by stoney 81ta
tks Poncho,mine is just the upper hose to the housing,fitting on a performer intake all 350 or 305 with one inlet should be the same?
There are dozens of different types (cast, billet, O-ringed, chromed, anodized), different materials (steel, aluminum, zinc), they're made with different angles (90 degree, 45 degree, 15 degree, straight up, adjustable, to name a few).

If you go to Summit you can take a look at what they have and go from there.

I will say the cast chromed zinc necks w/the O-ring are the crappiest things going- they leak and will corrode in no time. Any OEM neck is good, a steel neck is also good. Aluminum is better than zinc IMO, but the chromed zinc are the worst.

I always use a gasket, not just RTV. Be sure to use anti seize on the threads, and use a thermostat.
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Old 07-03-2010, 07:42 AM
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Quote:
Originally Posted by cobalt327
There are dozens of different types (cast, billet, O-ringed, chromed, anodized), different materials (steel, aluminum, zinc), they're made with different angles (90 degree, 45 degree, 15 degree, straight up, adjustable, to name a few).

If you go to Summit you can take a look at what they have and go from there.

I will say the cast chromed zinc necks w/the O-ring are the crappiest things going- they leak and will corrode in no time. Any OEM neck is good, a steel neck is also good. Aluminum is better than zinc IMO, but the chromed zinc are the worst.

I always use a gasket, not just RTV. Be sure to use anti seize on the threads, and use a thermostat.
Thanks for the advice,as for the chrome ones they are crap thats what i have now.
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