The 'R' I was referring to was for the AC plugs which you said was R44/R45.
The reach is 3/8" for the 6x (all stock heads) I believe.
The .460" reach is for the Ehead type of heads.
I know the 6X uses tapered seats, but not sure what the NGK plugs nomenclature is.
BTW the AC plug would be a 44TS or 45TS for non-resistor tapered seat plug.
(the 'T' is for tapered)
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John Wallace - johnta1
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