Ok, guys, after many attempts with a long bar over a 1/2" wrench, I can't budge that plug. I don't want to heat it up as the engine is painted. I'm going to invoke the "let a sleeping dog lie" rule & assume that it's a by-pass filter. It's working fine & I learned some stuff from this thread. Thanks!
~Denny
1953 Chevy 3100 w/1960 261 cid, 848 head | Weber 32/36 progressive 2 barrel carb. | Three on the tree & 3:55 torque tube | 12 V w/Gener-Nator & 6 V starter
In the Gallery Forum1998 Chevy Suburban 350 ci awd/4wd