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Sounds like the rad is statring to plug up. I had the same problem with my car but it ran at 230. Itried electric water pump and fans, 22" rad to a 26", mechanical water pump and fan, Boiled and flow tested the 26" rad and still no luck. Put the rad out of my buddy"s 68 dart, 22" 3 row. It was...

Fixed my overheating problem. Installed a new rad , 22X17 3 row out of a 68 dart. The car runs 180 in 90 degree weather and 160 when it is cool out. No shroud and a stock 7 blade fan.

The part that gets me is I have a 68 newport custom with a stock 383 2 bbl. This car has 93.000 original miles. Ican drive it on the highway at 80 mph all day and it won't over heat. It can be driven in bumper to bumper traffic in the heat and it won't overheat. It never has left a coolant...

Thanks for reply, don't have room for a shrould, use 50/50 water antifreeze with water wetter, have 7 blade fan and is correct, tried different t stats and a resticter disc, no trapped air, hoses ok, there was some crap in the block but removed a couple of frost plugs and washed it out, the only...

I have a 66 Valiant (amarican dart), 400 with stock heads,M1 single plane intake, 2 1/4" with 4" collectors fender well headers, 4" flowmasters, .528-284 mech cam, MSD 7al2 ignition. Had a wilder 383 before but too much for the street. My problem is that once it gets hot it won't cool down. I...