Thermostate diameter
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Senior User
Joined: May 2007
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Thermostate diameter
Hey everybody
did the 2v truck 360 and 390 intake manifolds use a smaller diameter thermostat and housing than the 4v manifolds like an S code or performer RPM? The thermostats that I"ve been able to buy are always much smaller in diameter that the recessed area in my water neck. I can't seem to keep the thermostat perfectly centered when I install it, so I have significant coolant flow through the radiator way before the trucks warmed up- so it often doesn't warm up at all. My truck had an S code manifold on the 360 when I bout it, and I now have a performer RPM on the 390, so I've never seen one of the original intakes for the truck engines.
Thanks
did the 2v truck 360 and 390 intake manifolds use a smaller diameter thermostat and housing than the 4v manifolds like an S code or performer RPM? The thermostats that I"ve been able to buy are always much smaller in diameter that the recessed area in my water neck. I can't seem to keep the thermostat perfectly centered when I install it, so I have significant coolant flow through the radiator way before the trucks warmed up- so it often doesn't warm up at all. My truck had an S code manifold on the 360 when I bout it, and I now have a performer RPM on the 390, so I've never seen one of the original intakes for the truck engines.
Thanks
Needsmorecoffee.
Joined: Oct 2004
Posts: 3,624
Likes: 2
From: CT
It sounds you have a earlier thermostat housing for the larger stat. Ask for a thermostat for a Mopar 318/440. It's the same dia (63 MM) as the larger FE stats. Most part houses only know/list the smaller one. NAPA is a #191 thremostat 180*. Just ask for the right temp range you need.
Senior User
Joined: Aug 2006
Posts: 418
Likes: 0
It sounds you have a earlier thermostat housing for the larger stat. Ask for a thermostat for a Mopar 318/440. It's the same dia (63 MM) as the larger FE stats. Most part houses only know/list the smaller one. NAPA is a #191 thremostat 180*. Just ask for the right temp range you need.
