Reprint from Wheels August 1975, enjoy!
(http://img.photobucket.com/albums/v83/Memphismazda/2007-11-28071335.jpg)
(http://img.photobucket.com/albums/v83/Memphismazda/2007-11-28070040.jpg)
(http://img.photobucket.com/albums/v83/Memphismazda/2007-11-28070129.jpg)
I notice in the article that it says that the firing order was changed to make the engine smoother. I have heard this before, but I don't think it is true. I haven't got anything here to verify it. Anyone know ?