Time for a reseal. The definitive answer will be when you take it to a
shop with a smog "sniffer".  Start engine.  Remove cap from header tank.
Insert sniffer probe.  If you get any HC reading, you've got combustion
gases leaking into the cooling system. To determine which head, remove
all the spark plugs. The one plug that's significantly cleaner than the
others is the leaker. (Steam cleans the plugs right off.)

Jim

MICHAEL POPE wrote:

>well the pressure was tested at idle and at about 2,000 rpm- mech(old owner had it done) said it was 14 psi went up to about 17 psi
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