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Old Jun 25, 2011 | 04:32 PM
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which thermostat

Which degree thermostat should I used on my 390? I'm goin to change the fluid and figured i'd change that as well.
 
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Old Jun 25, 2011 | 05:36 PM
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180 degees. I went with a Stewart EMP hi-po from Summit racing. That and the Summit hi-po water pump totally changed the cooling characteristics of my 428 CJ for the good.
 
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Old Jun 25, 2011 | 06:14 PM
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which one?

Compare - SummitRacing.com
 
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Old Jun 25, 2011 | 06:26 PM
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Originally Posted by NW 150

For the water pump I used the Summit #SUM-312421 - $66.95
" " T-stat - #EMP-301 - $14.88

Do Not Use the Flow Kooler Pump!! I tried it and the accessory bolt holes did not line up. Had to send it back.
 
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Old Jun 25, 2011 | 06:37 PM
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well I probably won't be buying a new water pump as of right now because I have no reason to believe the on there is bad, but thanks for the info on the thermostat! I don't know for sure yet because I haven't taken the old one out yet, but i'm sure it could be replaced. Same goes for the fluid, just regular antifreeze or anything specific?
 
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Old Jun 25, 2011 | 06:57 PM
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Originally Posted by NW 150
well I probably won't be buying a new water pump as of right now because I have no reason to believe the on there is bad, but thanks for the info on the thermostat! I don't know for sure yet because I haven't taken the old one out yet, but i'm sure it could be replaced. Same goes for the fluid, just regular antifreeze or anything specific?
I changed them both at the same time so I don't know if one made more of a change than the other or if a combo. Happy with the results however since in the summer we have no prob. being in the 90's or 100's.
 
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Old Jun 25, 2011 | 07:03 PM
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did you use the 50/50 mix or straight antifreeze? granted you can just add water to the straight coolant to make 50/50 i guess
 
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Old Jun 25, 2011 | 07:04 PM
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I just use the Stant brand 180* and drill one 1/8" in the outer ring and install with hole at 12:00. Nothing fancy here.
 
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Old Jun 25, 2011 | 07:05 PM
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I always use 50-50 mix year round here on the crusty coast. With the aluminum rad I use distilled water.
 
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Old Jun 25, 2011 | 07:06 PM
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I use 50/50 Prestone and why not use something engineered instead of drilling holes in something.
 
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Old Jun 25, 2011 | 07:12 PM
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Okay cool i'll go to summit after work tomorrow and pick one up and go change it.
 
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Old Jun 25, 2011 | 07:27 PM
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As stated before, I also only use distilled water.
 
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Old Jun 25, 2011 | 07:31 PM
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Originally Posted by 69cj
As stated before, I also only use distilled water.
Is it alright to use water from the hose out back from the house? It's just the stock radiator I believe. The guy I bought the truck from last year said something like a 3 or 4 core which shouldn't mean anything about water to use.
 
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Old Jun 25, 2011 | 07:36 PM
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Originally Posted by 69cj
I use 50/50 Prestone and why not use something engineered instead of drilling holes in something.
I'm cheap and it works.
 
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Old Jun 25, 2011 | 07:37 PM
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Hard water and terbidity can cause cooling system problems. Your choice, your truck. Distilled water is so cheap, why chance it?
 
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