In a message dated 98-05-26 11:41:10 EDT, katsuki@bbn.com writes:

<<
 Peter,

 I've used these in my 87 and 90, in addition to  using the standard plug,
 and there are no interference problems with the US version engine.   You
 don't by chance have a high compression engine, do you (does your manual
 spec high test gas only?).   Was there any evidence that the end of the
 plugs were being hit by the piston?   If it made a noise, you would easily
 see the evidence on the plug.   BTW, I've never heard of interference
 between the plug and piston for any engine.

 Dave   >>