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  #11  
Old 10-16-2013, 09:05 PM
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sully sully is offline
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Join Date: Jul 2004
Boat: 09 214 Prostar
Location: Minnesota
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I switched to Iridiums (AC Delco 41-993) in our 09. It was good switch, she seems to run a little better.
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  #12  
Old 10-16-2013, 10:29 PM
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501s 501s is offline
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Join Date: Mar 2012
Boat: 2013 X-30, 6.0L, 2500lbs of Ballast, 650lbs of Lead.
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My dealer wanted over $200 for the 8 plugs, but didn't have stock so I went to a local auto parts store and found the proper 41-110's. Cheap too.
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2013 X-30, 6.0L with 2500lbs of ballast and 500 lbs of lead.

Last edited by 501s; 10-17-2013 at 03:04 AM.
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  #13  
Old 10-16-2013, 10:29 PM
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501s 501s is offline
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Boat: 2013 X-30, 6.0L, 2500lbs of Ballast, 650lbs of Lead.
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And I wanted Togo with exactly what Ilmor recommends.
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2013 X-30, 6.0L with 2500lbs of ballast and 500 lbs of lead.
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  #14  
Old 10-17-2013, 04:20 AM
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KahunaCraft KahunaCraft is offline
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Wondering if you'd be better to wait until spring to change them. Large variations in temperatures (winter) and electronics. Likely little impact, might be a false worry.
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  #15  
Old 10-17-2013, 07:47 AM
eficalibrator eficalibrator is offline
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Boat: 2011 ProStar 214
Location: Great Lakes
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The "normal" plug for the whole GM LSx engine family (which includes the 6.0L) cross references with an NGK TR5 (copper). There are platinum and iridium variants also available at just about any auto parts store.

FWIW, NGK heat ranges get colder with increasing numbers, so a TR6 is the next colder plug for this engine that we would use on a supercharged application. Since this is a marine engine that intentionally runs cooler, I would not go any colder on the plug for fear of fouling, so you're best to stick with something like a TR5 or TR55ix (iridium, pre-gapped).
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