Question and Issue
Senior User
Joined: Apr 2004
Posts: 259
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From: Eastern Ohio
I love controversy.
I also love to throw gasoline on the fire.
This is a debate over fluid mechanics and thermodynamics.
I got B's in both. Believe me, I lived by the saying, "D" is the fourth letter in the word credit.
A 351 Cleveland has a removable orifice plate which restricts coolant flow back through the block. Left out, too much coolant will bypass the radiator, resulting in overheating. Installed, everything is fine. The 351M/400 has the restriction cast into the block. So the question is, does the 351 Cleveland use a bypass thermostat? If it does, sounds like the 400 should have one too. If it doesn't, sounds like the bypass is not an issue after initial engine warm-up.
By the way, I go to NAPA and ask for a Ford 351M/400 195 degree thermostat, put it in, and run the crap out of my motors. Haven't melted one down yet.
I also love to throw gasoline on the fire.
This is a debate over fluid mechanics and thermodynamics.
I got B's in both. Believe me, I lived by the saying, "D" is the fourth letter in the word credit.
A 351 Cleveland has a removable orifice plate which restricts coolant flow back through the block. Left out, too much coolant will bypass the radiator, resulting in overheating. Installed, everything is fine. The 351M/400 has the restriction cast into the block. So the question is, does the 351 Cleveland use a bypass thermostat? If it does, sounds like the 400 should have one too. If it doesn't, sounds like the bypass is not an issue after initial engine warm-up.
By the way, I go to NAPA and ask for a Ford 351M/400 195 degree thermostat, put it in, and run the crap out of my motors. Haven't melted one down yet.
Senior User
Joined: Feb 2009
Posts: 308
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From: Southern NM
What type of vehicle are you running?Most folks would use a shroud on the radiator.Helps the fan pull cool air over the core.You can also set the "pitch" of the fan by adding/subtracting spacers to achieve maximum air flow.Read the article about how the thermostat works.It will clear up a lot of misconceptions here.Stant also makes two thermostats for 335 Series.The P/N's are 13469(195 deg.)and 13468.(180 deg.)
Lead Driver
Joined: Mar 2004
Posts: 8,924
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mark, you obviously don't understand or care to understand how the 335 cooling system works. a 'dimensionally same' chevy or Windsor style thermostat does not control the INTERNAL BYPASS of the 335 series engines.
the spring is not the difference.
ARE Cooling (Aluminium Radiators & Engineering P/L)
here you are running a 160* stat in an attempt to run slightly lower operating temperature, all the while a significant amount of your coolant is just recirculating through the block and never going to the radiator. as your engine reaches 160* your stat opens sure enough, so what? it's not shutting off the bypass. the only thing controlling the temp of your engine is the balance between the amount of coolant going to the radiator and the amount of coolant recirculating through the bypass.
if for any reason you coolant level goes low, that balance is gone, all the coolant will only recirculate and you'll overheat FAST, rather than what coolant you have left going to the radiator like it should and you keep driving.
good luck, i've explained it enough for you.
the spring is not the difference.
ARE Cooling (Aluminium Radiators & Engineering P/L)
here you are running a 160* stat in an attempt to run slightly lower operating temperature, all the while a significant amount of your coolant is just recirculating through the block and never going to the radiator. as your engine reaches 160* your stat opens sure enough, so what? it's not shutting off the bypass. the only thing controlling the temp of your engine is the balance between the amount of coolant going to the radiator and the amount of coolant recirculating through the bypass.
if for any reason you coolant level goes low, that balance is gone, all the coolant will only recirculate and you'll overheat FAST, rather than what coolant you have left going to the radiator like it should and you keep driving.
good luck, i've explained it enough for you.
Thread Starter
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Posting Guru
Joined: Jul 2007
Posts: 1,355
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Around here people dont even use them, iv never ran any thermostat in none of my engines.... ive always thought they were ment to make engines go to temp faster, I never said my engine was overheating, i just wanted to know if the hotter temp was better than running cold, always thought an engine running colder would last longer, but hey everyday we learn something new...
Senior User
Joined: May 2011
Posts: 398
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From: Wrights community
just to make this thread alive again and answer a question: So does the thermostat by pass the coolant away from the radiator until the temp reaches the thermostats spring temp, then allow the coolant to flow through the radiator?
Posting Guru
Joined: Dec 2002
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From: chicago burbs
Yes you have it right, i would only ad "So does the >correct< thermostat by pass the coolant away from the radiator until the temp... "
because a generic, mr gasket, Windsor style, AMC T-stat will not cause the bypass to shut off when the engine reaches temperature. the radiator can't cool water that never goes to the radiator
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