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what do you think??

A 16 or any cap should not puke at 200 deg F, that's not even 212 sea level boiling temp. I'd get another 16 lb cap and if you have access to a Stant radiator pump kit I'd pressure check the block when hot to 15 lbs for a combustion leak and the current cap to 15 lbs also but to k.i.s.s. most likely cap is shot

live every 24 hour block of time like it's your last day on earth