Originally Posted by
8&stuff
if your talking os in your grp you will strip the head button threads. try a odo97t. best plug for grp tuned unless you use grp. os plug are a totally different taper than the odo or grp plug
No, its not, but it might leak easier.
The cone is slightly different, but it works this way. Using GRP plugs in a O.S. would be murder - but then againg - who would do such a stupid thing?