[spareparts]

if you want ot buy one of those temp guns, Harbour Freight has them for under $50. NAPA sells them for $75, They really are handy to have around. Other wise go to a welding shop and get some temp sticks, they look like a crayon, they melt at a prescribed temp, get one for 150, 175, 200, 225 temps, when your alarm goes off, stick it to the head and see which one melts. Your block pressure seems high, but not knowing the accuracy of your gauge( all instruments are subject to question), I would verify that you do have a heatiing problem first, tehn look at the poppit valve, theres not much in that block to restrict water flow other than the poppit valve. You may have a bad alarm module screwiing with you.