Had one of the 74 for years. I do not remember what the actually application was that I used. Since most caps are the same physical size that is not the issue. What you need is one with the correct pressure setting as the Pinto used. Find a parts man who can use their head and not rely on a computer as you will want say a 10 pound cap for a closed system or coolant recovery system. Most now days are going to want to know the application and that will be the stumbling block you run into. Not car applications but International Harvester Loadstar trucks out of the mid 70's used a recovery system and I believe they were around 13 pounds. Their tractors and combines also used a closed system. 3388, 3788 tractors or 1460, 1480 combines would be some models you could give them to look up.

nnn0wqk
"... as you will want say a 10 pound cap for a closed system or coolant recovery system."


vegasjerry921
"Pressure is not the issue. It's the ability to bring the coolant back to the radiator as it cools."


Yes, that is what "nnnOwqk" is saying. You need a cap that does as you say. A "closed system cap" works as you describe and is what you need,  - it is just another way of saying it (in more technical terms).


You might consider contacting a company like Stant and see is they have a cap of the physical dimensions, pressure and is for a closed system.

The only thing is he has a 72 with the 2.0 radiator (17") and it MIGHT have a different size cap.  The 2.3 cars have a 20" radiator. But, it only takes a minute to walk out to the car and see if the cap fits.

Same cap!