Let's try this again under the correct forum section...ops:
Heya all. I'm having an issue with my motor running really hot when at idle after running for a bit.
It's a '66 383/4spd. Last week on a hot & humid day I had it on the road and all was well and it stayed between 160-180 degrees. It ran great and stayed cool...until I got home. When it was parked and idling, it got hot really fast, (well past 210) and spit out almost half a gallon of coolant through the overflow hose.
I know that it wasn't overfilled because I had just checked it, and prior to this happening I didn't notice anything out of the ordinary and hadn't ever had a coolant leak or overflow. It does have an aftermarket radiator from Summit, but it appears to be fine. No leaks or anything else I can see. The engine is in excellent mechanical shape and has under 5k miles after being completely rebuilt/machined.
The only thing I have noticed out of the ordinary is that the radiator cap on it is rated for 7lbs, but the oem cap for this engine without A/C is supposed to be 13lbs. I also know that the cap on it did not come with the radiator and is probably just a universal aftermarket part. I know that the fan and water pump are also fine. My only other thought is that it could be a bad thermostat. I'm far from an expert with this so I realize there's probably stuff I'm not looking at that I should.
Anyone had this happen in the past, or have any ideas? Thanks much in advance for any help!
Heya all. I'm having an issue with my motor running really hot when at idle after running for a bit.
It's a '66 383/4spd. Last week on a hot & humid day I had it on the road and all was well and it stayed between 160-180 degrees. It ran great and stayed cool...until I got home. When it was parked and idling, it got hot really fast, (well past 210) and spit out almost half a gallon of coolant through the overflow hose.
I know that it wasn't overfilled because I had just checked it, and prior to this happening I didn't notice anything out of the ordinary and hadn't ever had a coolant leak or overflow. It does have an aftermarket radiator from Summit, but it appears to be fine. No leaks or anything else I can see. The engine is in excellent mechanical shape and has under 5k miles after being completely rebuilt/machined.
The only thing I have noticed out of the ordinary is that the radiator cap on it is rated for 7lbs, but the oem cap for this engine without A/C is supposed to be 13lbs. I also know that the cap on it did not come with the radiator and is probably just a universal aftermarket part. I know that the fan and water pump are also fine. My only other thought is that it could be a bad thermostat. I'm far from an expert with this so I realize there's probably stuff I'm not looking at that I should.
Anyone had this happen in the past, or have any ideas? Thanks much in advance for any help!