Originally Posted by jyeung528

might wanna recalibrate your feel and see if you're actually getting it to 22 ft/lbs.

also, depending on which plugs you use, on initial install there might be specific install instructions such as 3/4 turn after contact or something like that.

i suspect feel is the culprit here, plugs shouldn't be backing out.

Originally Posted by cosmomiller

Me too.

Billman recommends 22 ft/lbs. He had a spare head and ran a test to see how far he could torque a plug before failure. As I recall he went to 70-80 ft/lbs before the plug failed. The threads were still intact.

All kinds of problems rise to the surface from loose plugs. Just torque them down right the first time. Don't use anti-sieze on NGK plugs. They have a coating called trivalent plating. This silver-or-chrome colored finish on the threads is designed to provide corrosion resistance against moisture and chemicals. The coating also acts as a release agent during spark plug removal.

Originally Posted by freq

I have my elbow calibrated yearly too.

Originally Posted by s2000sccaracer

Since this is the Racing and Competition forum, change them at least at the beginning of the race season, whether or not they need it. For everything else that you are spending on a "race" car, spark plugs are relatively inexpensive.