NOOOOO!!!!!
Get a 16, MINIMUM!!!
Aluminum can't handle it??? Hmmm. We use a 24 pound cap in the Sprint car, and we ran a 32 pound cap in the Taurus when I worked for Bill Elliott.
Unless it's made from foil, your aluminum radiator will be fine. If you have concerns about the rest of your system, I suggest you have it pressure tested first.
Take care,
~Chris
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