Not to take away anything cre mentioned, as his advise is really solid as always, but indexing the plugs in the head design that Supra uses is a useless gesture. In Chevy's, Ford's, and other deigns that have the spark plug on the side of the combustion chamber, spark plug indexing can have more of an effect, since an electrode can easily impede the flame front from reaching the rest of the fuel/air charge. On Supra's and other similar designs, the spark plug is dead center of the symmetrical combustion chamber. It has no effect which direction the electrode is pointing.
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