Thanks
It seems they offer 120 & 140 for the 500 SEC
I have to look up 84 as there is no 83 500 SEC in USI also looked up
83 380 SEC & they also offer same 120 & 140 rad cap.

So not sure what my car uses though there is a 120 on it now.

Just wondering if a Euro engine could use different.

Seems the cooling system in Euro is same specs as US

So I guess I would go with the 120 as its on the car
but maybe thats a problem.

How can I find out what rad cap psi is best?

Thanks

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83 500 SEC Euro 198K