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Old 06-05-2013, 02:19 PM   #71
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Much over 220 is not that good for a older BBC. I think your problem is low flow, I have a SBC that would always heat up in traffic, and a lot on the interstate even with a 2400 CFM fan. I chased it for years, put a huge all aluminum racing radiator finnaly bought a flowkooler (FlowKooler Hi Flow Water Pumps) water pump, now it never goes over 190 (running a 160 stat) with a/c on and in traffic or on the highway.

When I was growing up we had a 1982 Allegro 28' with a 454, and it never got over 200, and we ran 75 MPH so I highly doubt speed had anything to do with it.

A few other causes could be, missing air dam (normaly under rad), excessive scale/crud in the cooling passages inside the engine, loose/slipping belt, bad fan clutch, bent/deformed fan blades, weak fan motor (if electric). Sorry if I repeated something you already done or someone mentioned, and I hope I didn't leave out something that I think you have already done
Well.....Im getting down to nothing left except blocked passages in the water jacket. Scale/Crud. Is there any way to deal with this issue? The motorhome sat for many years before I bought it (5 I think he said) without leaving his yard. So I suppose that's possible even though the coolant looks real good when I dumped it out of the radiator to start yhis project.
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Old 06-05-2013, 02:36 PM   #72
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I had a similar problem on a 94 Damon 454. It turned out to be a cottonseed filled radiator,well hidden by condenser. The recoring should have cleared that possibility. Good luck!
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Old 06-05-2013, 03:18 PM   #73
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I had a similar problem on a 94 Damon 454. It turned out to be a cottonseed filled radiator,well hidden by condenser. The recoring should have cleared that possibility. Good luck!

new radiator, not running condenser........for right now.
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Old 06-05-2013, 04:00 PM   #74
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Do you think that you might be running extremely lean. Have you used you IR temp gun to check manifold temps? I've read most of your posts, but I don't remember. Did you replace you radiator cap with a new one? Pressure leakage can quickly cause a overheating problem.
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Old 06-05-2013, 07:48 PM   #75
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Did you change the water pump?

Apparently there are two versions that spin in opposite directions depending upon the routing of the serpentine belt.

I didn't know that until I read it today
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Old 06-05-2013, 09:31 PM   #76
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Alrighty the verdict is in!! After many conversations with mechanics and Radiator shop today I finally got it figured out. Both the experts checked my work and agreed. I had an obstruction in the wAter jacket. Slag or crud blocking inlet ports inside the head. They advised me to stop on the way home and buy a radiator flush kit and some chemical slag dissolver. Aka radiator flush. I cut the heater hose and installed the inlet. I then dumped the coolant out and replaced with water per the instructions. Added the flush to the radiator and ran motor till it got up to temp. Ran for about 20 mins. Then I hooked my garden hose up to the inlet I just installed in the heater hose. Per instructions I flushed the coolant system until clean water came out. I think this might have burped the system too. Capped everything off and ran it down the road. Engine ran at 195 deg. There was a spike once as I stopped at a red light. Then I remembered that I l pulled the fuse from the electric fans during the radiator flush process to help heat the engine to operating temp. The surge was up to 205. I re-installed the fuse and it cooled right back to 195 deg. Think I finally got it.
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Old 06-06-2013, 07:44 AM   #77
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Those electric fans are really for the A/C unit only. Mine never kick on unless i'm sitting and idling. Maybe a second flush? Sounds like your on the right path.
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