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  #11  
Old 05-22-2012, 11:13 PM
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I'd personally choose a 180.

have you had to add any coolant to it at all over the past year or so?

What are you using to measure temp?
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  #12  
Old 05-23-2012, 07:24 AM
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Yes, I had a leak around the water pump, and before replacing the radiator cap fluid would vent from there (what a mess) when the engine got hot.

I'll try the 180 this weekend.
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  #13  
Old 05-23-2012, 07:35 AM
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Quote:
Originally Posted by ianacole View Post
I drive it daily...It's gotten worse over the last month or so. What temps were you normally running, prior to the fire, on your 383? Is 210 on a SBC a reasonable temp?
Its been a while but I don't recall anything over 200*. 210* is not that hot for a SBC. I was running a 195* and forgot to comment on your 160* Definitely change that out. I had a fancy pants liquid filled mechanical auto meter gauge with its sending unit mounted into the thermostat housing. So I knew exactly when the thermostat opened and closed. The OEM temp gauge had its sending unit in the side of the block. So I had two measurements of temp.

I drove that thing hard as I was still pretty young and dumb. Never had overheat issues.
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  #14  
Old 05-23-2012, 11:18 AM
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I run a 195* t-stat in my '83 GMC plow truck, but it mostly operates in the winter. I installed a t-stat housing temp gauge (mechanical) and found that Autozone sells a cast-iron (China-mfg) t-stat housing that has 'extra' ports on it - perfect for adding a sending unit. This part was super cheap - $12 or something.

I think 210* is ok - but I wouldn't go lot hotter. By running it hot, at least you burn off any condensate in the motor oil, which was my goal on the plow truck.
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Old 05-23-2012, 01:20 PM
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I run the stock 195 in my 5.3l powered 80 and it runs - 195 to 197 with brief spikes to 200 sitting at a stop light.

get rid of the 160 t-stat. and report back.
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  #16  
Old 05-23-2012, 03:51 PM
ianacole ianacole is offline
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Thanks. The T-stat is on the schedule for this weekend. I'll let you all know how it goes.

I didn't answer this earlier question: I'm using an autometer gauge.
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  #17  
Old 05-26-2012, 06:45 PM
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We looked up the OE turdmostat for a '75 C10 Y-code SBC, and it was the 195 degree unit. Replaced it today and went for a ride, and no change. Still climbing up to 210 and hovering there (I haven't wanted to push it to see if it will go further).

So, options? Get the radiator "cored" (is that the right term) and see if it needs a good cleaning? Replace the radiator? Or look at the block?
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  #18  
Old 05-26-2012, 07:01 PM
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Are you sure your getting all of the air out of the system?

Time to build a shroud.
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  #19  
Old 05-26-2012, 07:21 PM
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Yes, I believe so. I will tackle that next, but I still don't get why I didn't need one last year.
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  #20  
Old 05-26-2012, 08:27 PM
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Me either but you changed a lot of stuff most notably the water pump and fan. Good, same, or worse they are different. I'd build a shroud you should have one anyway. ANd make sure you get all the air of the system. I recommend this. It works every time. http://www.summitracing.com/parts/LIL-24610
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