On Tue, 15 Aug 2000, Bruce Plecan wrote: > GM O2 sensor, what size are the threads?. > 14mm is too small, 16 or 18?. > Bruce > Got 4 irons in the fire, two of which are about hot. 18x1.5 same size as a large thread spark plug. I happen to have a helicoil kit in just that size, because I stripped one of mine. Roger