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When I worked at Garretson’s with Jerry Woods he said run silver plugs. So in my S I run W4CS and in my race engine XR2CS. The silvers were 1/2 the cost of platinums and I have a lifetime supply. In projects I had picked NGK Iridium but will probably switch to copper if needed, like in all my old service days, where I never had any problems with them.
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