[alanmay0]

This may be a long description of my problem so just bare with me. I have a 1967 GTO. The engine has just been rebuild and it runs great. My problem is that it runs really hot. So hot that I can only drive it, at the most, 10 miles before it pegs the temp. gauge at 250+. It is not the gauge I have a infra red temp gauge that I check the temp with. I check at the thermostat housing to get the engine water temp from and then agian I check at the water pump inlet where the bottom radiator hose connects to the water pump. I do get about a 20 degree drop between the two locations showing that the radiator is taking out heat. I have a Butler performance aluminum radiator with two 10 or 12 inch fans, cant remember exactly which ones. This is what the guy at Butler suggested for this car. I have each fan set up on its own relay so if one stops the other will still run. I have a 160 thermostat in the car now. I did have a 190 and there is no difference in engine temp.. I have new water hoses and I have the spring in the bottom hose. I have tested the in dash temp gauge and it is working correctly. Remember I check the engine temp with the infra red temp checker so you can actually take the gauge out of the picture. The fans are set to come on at 160 and they do. The thermostat does open at 160 also. The engine has new anti freeze set at about 60/40. The water pump is a flow kooler, which is suppose to be one of the best. I have corrected the divider plate so that there is very little space between the flow kooler and the divider plate as seen on many youtube videos. I have done a little filing on the divider plate so that the hole going to the heads lines up. Like I said the engine hits 250 degrees in about 10 miles at most on a 85 degree day. At this point I have to pull off of the highway and let the fans run for about 20 minutes to pull the heat out of the radiator water before I can go another 10 miles. Now I only did this yesterday because I went to a car show. In the morning it was cooler so I only had to stop twice during the 50 mile trip but coming home when it was 85 I had to stop several times. Will not drive it again until I can figure out the problem. This is where I am hoping someone on this site can help me. In an effort to fix the problem I removed the radiator and fans from butler and replaced with another aluminum radiator I have and installed the 7 blade GTO cooling fan with shroud but it still overheated. I can say one thing, I belive that the 7 blade fan pulls much more air through the radiator than the two electric fans. Just my belief.

When I had the water pump removed for the 5th time I removed the thermostat and housing and ran garden hose water through the opening where the water would flow from the water pump into the heads. This is on the left side of the water pump housing looking at it from the front of the car. I could see that the water flowed through the intake manifold, where the thermostat is housed, and it came out through two holes on the right side of the water pump housing. This indicated to me that there is water flow through the heads. I Also turned on the heater and the heater blower motor inside the car and it was blowing air at around 170 degrees when the engine was hot. This indicated to me that the water pump was working. Also when the thermostat opens I can see water moving in the radiator. It does not seem to flow as fast as my other GTO flowed but no was to determine flow speed, that I know if.

Now one thing that I just noticed while watching another youtube on water pumps for 67 GTO's, for the first time is that this guy opened up the water pump on his pontiac 326 engine and inside the water pump housing there were to rubber seals, I guess, one at each hole inside the water pump housing. Looked like one where the water is directed to go through the heads and the other where the water comes out of the heads back into the water pump.

I have never seen those rubber seals used before on a GTO. I owned another 67 GTO and replaced and worked on the water pump and never used the rubber seals. also when I had the engine rebuilt the rebuilder did not install the rubber seals but he did give them to me with the other parts that were in the gasket kit that were not used.

So Should I use the seals or not. Has anyone else ran into similar problems with over heating and can anyone have any other suggestions for me to try.

I think I have covered everything in this post to explain my situation. Ok for now the timing is set at the factor 6 degrees BTDC and I am running premium gasoline. I have the quadrajet carb. and I think the air fuel ratio is correct.

I was told by a guy at butler performance that I needed to set total timing at about 32 because of the fact that in Texas I can not get gas without ethanol in it. As far as I know the compression of my engine is still 10.5.

OK that's it any help or suggestion will be appreciated.

alan