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According to
IW22 are Denso Irridiums, and are for 4 pot Esprits.
(which I have in my own car, and have the box to prove it)
According to, the V8 can take a NGK BKR6EIX Irridium plug.
(and again, I have them in my V8 and have the boxes to prove it) ;)
I didn't see a Denso Irridium plug listing for the V8.
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