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not getting to temp

  1. 5.0/5.8 Engine Tech
    hey guys, i just finished building a 331 for my 90 lx, it doesnt want to get up to opperating temp. guage reads no higher then 140-150 degrees even after long city drives. i already tried replacing the thermostat (tested both the new one and the old one, both work fine and didnt fix the...