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Old 05-28-2019, 05:18 PM
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1983 CJ7 with Chevy 350 Coolant Questions

Wife just bought me a pretty mint/rebuilt frame off restoration. Holy sh!t!



Has a Chevy 350 small block installed 2 owners ago (~1,000 miles). Runs great, but there are 2 issues. First it doesn't have a coolant overflow tank and the rad (hefty aluminum aftermarket now sure manufacturer) drips a bit when hot.



Can I install a stock CJ tank to handle this?


Second It seems to run a bit on the hot side. Do we have any 350 cooling experts here at WF?

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Old 05-29-2019, 09:52 PM   #2
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Wife just bought me a pretty mint/rebuilt frame off restoration. Holy sh!t!



Has a Chevy 350 small block installed 2 owners ago (~1,000 miles). Runs great, but there are 2 issues. First it doesn't have a coolant overflow tank and the rad (hefty aluminum aftermarket now sure manufacturer) drips a bit when hot.



Can I install a stock CJ tank to handle this?


Second It seems to run a bit on the hot side. Do we have any 350 cooling experts here at WF?
A stock CJ overflow tank can handle it. See my build in the CJ section section. I installed a Novak 3 core aluminum radiator in my Jeep designed for CJ's with a 350.

My engine is bored .030 over so its a 355. Ported heads, bigger cam, bigger valves and it runs at 200 degrees sitting still with the electric fan they make.

Hope this helps

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Old 05-29-2019, 10:27 PM   #3
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...Does she have a sister?
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Old 05-30-2019, 06:43 PM
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A stock CJ overflow tank can handle it. See my build in the CJ section section. I installed a Novak 3 core aluminum radiator in my Jeep designed for CJ's with a 350.

My engine is bored .030 over so its a 355. Ported heads, bigger cam, bigger valves and it runs at 200 degrees sitting still with the electric fan they make.

Hope this helps

Thanks. Should be installed by saturday.


Found the issue. The fan fuse was blown. Gotta figure that out now... 10A seems too small. Not sure what the current fan is rated at - no tag/label on the damn thing.
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Old 05-30-2019, 06:46 PM
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...Does she have a sister?

half sister whos married...
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Old 05-30-2019, 08:54 PM
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A stock CJ overflow tank can handle it. See my build in the CJ section section. I installed a Novak 3 core aluminum radiator in my Jeep designed for CJ's with a 350.

My engine is bored .030 over so its a 355. Ported heads, bigger cam, bigger valves and it runs at 200 degrees sitting still with the electric fan they make.

Hope this helps
BTW your build is killer!


I need to clarify something. Running a little hot was certainly b/c fan not running. Found a 10A fuse blown (right off battery), which seems small - all diagrams I have seen are 25-30amp fuses off the battery for the fan.



Cant find an amp rating for the relay.
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Old 05-31-2019, 06:12 PM
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Fuse was too small on fan power supply. Had a minimum amp pull of 18A once I found the tag on radiator. Put a 25a in place and works fine!
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Old 05-31-2019, 08:41 PM   #8
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BTW your build is killer!


I need to clarify something. Running a little hot was certainly b/c fan not running. Found a 10A fuse blown (right off battery), which seems small - all diagrams I have seen are 25-30amp fuses off the battery for the fan.



Cant find an amp rating for the relay.
Thank you, glad its working out
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Old 07-28-2019, 01:06 PM
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Just as a final update. I installed an aftermarket overflow tank and it works just fine.
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Old 09-03-2019, 02:42 PM   #10
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Thanks. Should be installed by saturday.


Found the issue. The fan fuse was blown. Gotta figure that out now... 10A seems too small. Not sure what the current fan is rated at - no tag/label on the damn thing.


The fan fuse should be 5-10A and the fan should get its power from a relay.

It sounds like they didnít wire the fan with a relay.


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