I just bought a Canton coolant tank but I didn't get a radiator cap for it. I see RPM Outlet's website that shows a 16psi cap and a 18 psi cap. My stock one is 16 psi. Is there any problem going with a 18 psi one?
When I bought my Canton Overflow Tank a couple years ago, I told them to throw in a run of the mill cap until I found a better looking cap later. They gave me a 8-10 pound cap. It says "For Racing Use Only" but I've never really raced my Mach alot, and it never leaked or anything. Not sure about a 16-18 pound cap.