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'99 - '06 GM Truck Modifications
Engine & Performance
Which is correct spark plug? 2006 5.3
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<blockquote data-quote="adriver" data-source="post: 16780" data-attributes="member: 795"><p>Old thread, but</p><p>The Iridium plug, 41-110 (with a .040 gap) was the originally installed plug when they started the NBS/Gen III LS. I think it was in 2003, but at some point early on, they changed the plug to the platinum and it became the superseded part number. The platinum plug 41-962 has a .060 gap. I think I have only seen them come pre-gapped, but you can use either one. </p><p></p><p>The Iridiums will last about twice as long (100k miles vs ~60K miles) but also cost about twice as much. SUPPOSEDLY the iridiums are two hairs better for performance, but if someone knows details why, they know more than I do about em. I think it has to do with the shorter gap having a "more responsive spark". I felt an improvement when I installed iridiums, but that could obviously be from just putting in new plugs so it's not really fair to mention. My guess is GM only did it, (downgraded) to save a few bucks.</p><p></p><p>In the 02 owner's manual it has the replacement plug listed as NGK PZTR5A15 (iridium)</p><p><a href="https://www.sparkplug-crossreference.com/convert/NGK_PN/PZTR5A-15" target="_blank">NGK PZTR5A-15 - Cross Reference | sparkplug-crossreference.com</a></p><p>(The GM part number for 4.8/5.3 is PTJ14R15. For the 6.0 it is PTZ16R15, yet both have the same NGK plug number).</p></blockquote><p></p>
[QUOTE="adriver, post: 16780, member: 795"] Old thread, but The Iridium plug, 41-110 (with a .040 gap) was the originally installed plug when they started the NBS/Gen III LS. I think it was in 2003, but at some point early on, they changed the plug to the platinum and it became the superseded part number. The platinum plug 41-962 has a .060 gap. I think I have only seen them come pre-gapped, but you can use either one. The Iridiums will last about twice as long (100k miles vs ~60K miles) but also cost about twice as much. SUPPOSEDLY the iridiums are two hairs better for performance, but if someone knows details why, they know more than I do about em. I think it has to do with the shorter gap having a "more responsive spark". I felt an improvement when I installed iridiums, but that could obviously be from just putting in new plugs so it's not really fair to mention. My guess is GM only did it, (downgraded) to save a few bucks. In the 02 owner's manual it has the replacement plug listed as NGK PZTR5A15 (iridium) [URL='https://www.sparkplug-crossreference.com/convert/NGK_PN/PZTR5A-15']NGK PZTR5A-15 - Cross Reference | sparkplug-crossreference.com[/URL] (The GM part number for 4.8/5.3 is PTJ14R15. For the 6.0 it is PTZ16R15, yet both have the same NGK plug number). [/QUOTE]
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'99 - '06 GM Truck Modifications
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Which is correct spark plug? 2006 5.3
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