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Shovelhead Kevin
Joined: Sun Dec 10th, 2017
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Yup, that's because of the wasted spark system, one bank has double platinum plugs spec'd and the other only single platinum.
One side sparks from center to outside, the other is switched around - meaning it wears either the outside or the inside depending on which bank it's in.
After spending some time going through this, for once, i'm very happy not to go with the factory fitted plug, i just chose the right NGK plugs i pic'd on the previous page, gap them correctly and they're running very well.
I've indexed plugs for race cars & Harleys so I had a feeling that the reason was probably something along those lines.
So what....if I went with the NGKs or even the Autolite APP103s I'll still have to manually index one side? {Assuming that one side will already be indexed out of the box...} Or am I missing something here?
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The good we do is never remembered, the bad...never forgotten.
1998 4.0 XLT ExtCab 4x4 {lil Red/Mine}
2005 Honda Civic {Hers/Ours/Spare}
2015 Hyundai Accent {Hers}
1980 80" Harley FXLR Custom {ALL mine!}