Before you use a PMA plug, get your hands on one and see that your spark
plug wrench is deep enough to get onto the hex. Some plug manufacturers put
the hex all the way down on the bottom, and a standard plug or deep well
socket bottoms out before getting to the twisty part.

Jim




I'm leaning towards PMA'd equiv like Autolites. I've been happy
with PMA'd
oil filters, air filters, vacuum filters, etc so far. Something about
paying for a
name bugs me.