Are new aluminum radiators better?

Dana67Dart said

When I was running a 7lb cap I boiled over a lot I put the stock (for my 67 273) 16lb cap no more boiling over.

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Im not running A/C I assumed thats why it has a 13lb psi cap when i bought it. the FSM says 14psi is standard. Would a 16 psi make any difference?