I’m trying to fix the water leak problem on the crossover at the top of the water pump. I was able to get a new O ring. It leaks when I’m filling the radiator without even having any pressure. I got a new seal from the local auto parts shop that is for this year and model. I’ve tried putting a washer that fits in the top of the water pump to put pressure.
The car is a 63 Coupe De Ville but it has a 64 429. If the previous owner used the crossover from the original motor, which from I’ve researched was a 390, would the crossover work. I have a machinist looking at it and trying figure it out.
Any info would be much appreciated.