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| Joined: | 03-13-2005 |
| Location: | Salt Point, New York USA |
| Posts: | 208 |
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7 psi cap is what came from the factory with the car. I am sure since I bought the car new in 1974.
You would not want a cap with a pressure rating higher than the systems as it would not protect the system. Think of it as a fuse.
Mine has always been 7 psi and it has never blown coolant yet.