General Category > Quadrajet Carb Talk and Tips
66 GTO 455 overheating
Jeffs68:
For what it's worth, and i'm not sure about the goat, but the idiot light on my Firebird won't come ON until 242 degrees, that's the spec if I remember correctly.
thor7726:
I pulled a spark plug and it looked great. I don't think its running lean or that the carb is causing the overheating issue. I put my dad' 65 radiator and declutching fan in that his car runs a steady 180 and it didn't fix mine. The 455 must just need that much more of a cooling system. I ordered a 4-core Desert Cooler Aluminum radiator to see if that helps. The flow of the water pump seems to be pretty good when I took the cap off to take a peak before it pressurized. The engine compartment just gets so hot at 220F... Thanks for all the help, I'll keep you guys posted.
Jeffs68:
220 degrees on a fresh built motor, I don't think you're gonna get much better on that 455.
77cruiser:
What are your timing specs initial, mechanical & vacuum?
tayto:
--- Quote from: thor7726 on June 07, 2016, 08:50:52 PM ---The engine compartment just gets so hot at 220F... Thanks for all the help, I'll keep you guys posted.
--- End quote ---
Get something to shut coolant flow off to the heater core then. I've seen guys run a ball valve and shut off flow during warmer weather (extremely low tech). I would opt for a vacuum actuated valve myself, like GM used to shut off coolant flow to the heater core when AC was turned on. I'm sure you could source a 12v solenoid vacuum valve that could be run in parallel with the fan control switch which would allow vacuum to flow to a coolant bypass valve. AC controls of your era are generally a lot different than non-AC controls so it might not be as easy to adapter year correct equipment...
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