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Originally Posted by 1967Tempest
It is way cool that your daughter is involved. Did you try the easy, and free stuff?? Making sure the lower hose isn't collapsing, upper hose has no air etc...
Dave
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Hoses are brand new, I hope that that are not collapsing
I think we have tried all of the cheap stuff like checking the timing, burping air out, hammering down the divider, swapping the t-stat, etc. Carb is a loaner until I get my q-jet rebuilt, it smells rich and will water your eyes so i'm pretty sure it's not lean. I have no idea about the mixture though.
Next steps are to try the ac delco sending unit, double check the temp with a meat thermometer, and try to find a water pump with the right cast impeller to replace the flowkooler. I should know more by the end of next weekend, and i'll report back here then.
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Originally Posted by lester
I have a 75 400 in my 79 t/a . use the snding unit in the motor for what year and motor that was in your car. so it works with the gage in the car. i run a 160 stat now to. i had the 190 . then 180. i was over 220 with them. put the 160 t-stat in and I'm at 175 at 65mph all day long and 165 in town. fyi never shut down the motor when your braking in a cam. mine was at 240 at 2 grand and I held the water hose on the rad to bring it down to 220 and let it run for a 1/2hr. changing the rpm every 5 min.
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I have a 180 in there now. Might try a 160. The car was sitting on jackstands in the garage so I could not easily move it out in the driveway to put water on it (and the brakes aren't 100% yet either), so we shut it down when it went over 220. I've read where this is ok during cam breakin, I guess we'll find out.
Some on this thread have questioned their sending unit. I'm doing the same, when I turn the key on the gauge will jump up to 220 (if the engine is hot), and then without the engine running it will "creep" up to 240. Seems fishy to me.