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Exactly. It sounded like it was percolating. You could hear the thumping and see the upper radiator hose vibrate.

Greetings, I wanted to get back to everyone who offered their help to me, and to let you know my findings. I have pulled off both heads and believe that the driver side gasket may be installed incorrectly. The passenger side gasket has a small tab with the word FRONT marked on it. The word...

I'm probably a few months from attacking the heads. It will be a winter project when I relocate the bikes to the shed and the mustang indoors for a period of time. I will certainly be removing both heads. I'll probably have the local machine shop check them out and go through them. Although I...

I'd like to thank everyone for their input and ideas with my overheating issue. This weekend, I believe I've narrowed it down to be a head gasket or cracked head. I drained the water and added a 50/50 coolant, water, mixture. I left the water level about two inches below the filler neck. The...

Hemi Killer, thank you. To make me even more crazy, I did a re-test for combustion gases in the radiator. I could not get the test fluid to change color to save my life. I verified the fluid was good by testing at the tail pipe. The fluid turned yellow immediately. I purchased an infra red...

Negative on both.

Hemi Killer, By chance, would you have a manufacturer and part number for the correct 351C thermostat. I may look for an original restrictor plate.

Hemi killer, The aftermarket restrictor has only a flat surface that rest into the block, and a slight lip around it. I have already enlarged the bleeder hole. I think the idea of trying the 50/50 coolant is worth a try. I had only been using water after wasting a few gallons of coolant...

I installed a new lower hose and it doesn't appear to be collapsing. I purchased a spring to install in the hose. However, the inside diameter of the hose is smaller than the spring. Perhaps someone can offer a tip or trick to install the spring.

No. When I purchased the car I had the cooling system flushed and filled with coolant.

That's is where my problem is. If I allow the car to reach operating temperature without the cap, the water surges up and down in the radiator, and over flows out of the radiator fill neck. It will lose enough water to drop the level in the radiator down about five inches. Close to the upper...

I did remove all the spark plugs, and none of the had a washed or clean appearance. After testing positive for combustion gases in the radiator, I'm thinking that a head gasket, or cracked head, could be what is causing the water to spit out of the radiator.

Yesterday, I installed a temporary one gallon container as a coolant recovery reservoir. After driving the car about ten minutes, and making two stops, I inspected the temporary reservoir. It indeed had water that had overflowed into it. When I arrived at home, the amount of water in the...

Thanks to everyone for all the help. I am going to try the following. 1. enlarge vent hole in aftermarket aluminum restrictor plate. 2. Install a temporary catch reservoir 3. purchase the test kit for combustion gases. I'll report back with my findings

At this time, my cooling system is probably 98% water. Although it is a closed system, could the water be hot enough to dissipate within the system, and require the daily filling?

Don, I will look again at the restrictor plate. It did have a small hole in the center. Would it be o.k. if I increased the size of small bleeder hole in the center of the plate be. Perhaps going up only one or two drill bit sizes?

The knocking noise only appears after the motor is warmed up, and there is no rhythmic pattern to the noise. I've not seen any coolant come out of the overflow tube after driving and allowing it to idle, or after turning off the motor. I have surrendered to the belief that I may indeed have a...

Rocket, I have not seen any bubbles rising from the bottom of the radiator. the T stat is installed with the spring into the block. Earlier today, I pressure tested the system when the gauge on the dash indicated it was in operating temperature. I put 16lbs of pressure into the system. I...

I had taken the radiator into the shop and asked them to go through it. They said the found very little debris in it, and the radiator is not my issue. I am using a motorcraft t stat supplied by west coast classic cougars. it is for a 351c, 180 deg.1967-1973 mustang. However, it is not the...

Hey guys, thanks. Yes, with the T stat removed, I can clearly see the water circulating at the top of the radiator. I can see the water flowing through the openings within the radiator and into the area below the filler neck With the T stat installed, I don't see this circulation. It appears...