Originally Posted by
air8
To add to CasyP's response--Geo, or another user, measured the taper angle of the ODO plugs. The ODO plugs had a slightly different taper. Those guys suggested to keep using the same brand of plug, which ever that may be, that has been used in the engine previously. Switching back and forth from ODO to GRP/O.S. is where the leak-by came from. They mentioned the taper creates the fit and seal. If you use the different taper then it won't seal properly.
Someone correct me if I'm wrong here. But that's my recollection of the previous discussion regarding the turbo plugs.
this would be correct, i always use os plugs, and tried a od.....it was as 8 said....it was tight on the last turn, and squeaked.....if you didnt do that it would leak..
i willl put a grp plug in and see how it is...