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Old 08-10-2019, 10:44 AM   #1
qmdv
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Default 59AB thermostat

I just got my 59AB running well in a 32 Highboy. Even with a four blade fan 2 1/2 inches from radiator at idle parked in 85 degree weather the hottest it got was 140 degrees. New Walker radiator and those really good water pumps working well.

Are there thermostats available and where are they installed with Offenhauser heads.
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Old 08-10-2019, 10:57 AM   #2
JSeery
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Default Re: 59AB thermostat

There are a number of threads on thermostats. The modern style ones install in the radiator hose at the outlet of the heads. You have to come up with a way to retain them or they will flip inside the hoses. A second clamp above the thermostat is an easy way to do it. You can also install a tube inside the hose above them, etc.

https://www.fordbarn.com/forum/showt...t=thermostates

https://www.fordbarn.com/forum/showt...t=thermostates

Last edited by JSeery; 08-10-2019 at 11:05 AM.
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Old 08-10-2019, 11:41 AM   #3
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Default Re: 59AB thermostat

The correct thermostats for the '48 and earlier Fords mount in the upper hoses directly above the heads. The stats are made to slide up inside of the hose. See attached pix.
Stats in the 160-180 range what the factory recommended for year round use. Modern stats don't work well in an early flathead.
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File Type: jpg 32-26 Frd stats.3.jpg (42.2 KB, 111 views)
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Old 08-10-2019, 12:59 PM   #4
flatjack9
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Default Re: 59AB thermostat

And why would that be?
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Old 08-11-2019, 05:14 PM   #5
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Default Re: 59AB thermostat

Quote:
Originally Posted by blucar View Post
The correct thermostats for the '48 and earlier Fords mount in the upper hoses directly above the heads. The stats are made to slide up inside of the hose. See attached pix.
Stats in the 160-180 range what the factory recommended for year round use. Modern stats don't work well in an early flathead.


My 2 Flatheads both have modern stats , and both run under 195 - even on hot & humid 95 degree days . Just make sure your radiator is clean !
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Old 08-12-2019, 11:15 AM   #6
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Default Re: 59AB thermostat

Quote:
Originally Posted by flatjack9 View Post
And why would that be?
Because modern stats don't have large enough flow
openings and restrict the flow of coolant through the
engine and radiator. The best stats were Robertshaw
number 360-160, 360-170 or 360-180. Sometimes
they show up on the internet. G.M.
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Old 08-12-2019, 01:14 PM   #7
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Default Re: 59AB thermostat

So the Robert Shaw stays fit well in aluminum 59 style heads?
Those look like they would not turn like the flat ones.
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Old 08-12-2019, 10:16 PM   #8
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Default Re: 59AB thermostat

Blucar X2
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Old 08-12-2019, 11:11 PM   #9
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Default Re: 59AB thermostat

Quote:
Originally Posted by blucar View Post
The correct thermostats for the '48 and earlier Fords mount in the upper hoses directly above the heads. The stats are made to slide up inside of the hose. See attached pix.
Stats in the 160-180 range what the factory recommended for year round use. Modern stats don't work well in an early flathead.
Who sells those
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Old 08-12-2019, 11:56 PM   #10
RalphM
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Default Re: 59AB thermostat

You would have to find those NOS. Check with third generation automotive.
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Old 08-13-2019, 05:34 PM   #11
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Default Re: 59AB thermostat

After much research I have found that the Robertshaw 330-180 is highly recommended. As is the 360-180 also by Robertshaw. Does one work out better than the other and why.
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Old 08-13-2019, 08:45 PM   #12
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Default Re: 59AB thermostat

Quote:
Originally Posted by qmdv View Post
After much research I have found that the Robertshaw 330-180 is highly recommended. As is the 360-180 also by Robertshaw. Does one work out better than the other and why.
You got it a little mixed up. They are all the 330 type. The
second numbers are the temperature they open at.
330-170 is the 330 type and opens at 170. G.M.
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Old 08-13-2019, 09:34 PM   #13
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Default Re: 59AB thermostat

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Originally Posted by G.M. View Post
You got it a little mixed up. They are all the 330 type. The
second numbers are the temperature they open at.
330-170 is the 330 type and opens at 170. G.M.
Robertshaw also makes a 360-180. I have read where they are also the hot set up. Get it "hot" The 360 is a different series of dimension I suppose.

Well maybe not. I thought I saw a reference to the 360 series but cannot find it now

Last edited by qmdv; 08-13-2019 at 09:41 PM.
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