Today I bought a hex tool socket to get the 3/8" OD oil pressure sensor plug out.  With mucho torque applied via a 16" bar, the plug was still not giving.  Heating the plug is not an easy option due to proximity of the firewall, freshly painted block and aluminum intake manifold. 
     Thinking cooling might work instead, I sprayed it with an inverted can of computer cleaning air for about 15 seconds.  Bingo, the plug came out easily.
     Thanks for all the advice.  
     Dennis McGillis
     1965 Malibu SS-350

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