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Which spark plug for 496 Mag?

Old 07-05-2012, 09:50 AM
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Default Which spark plug for 496 Mag?

I'm sure this has been covered before but after wading through half a dozen threads I didn't find the answer. Which plugs are suggested for a stock 496 mag? I know the mercruiser's are high $ and it looks like most people are running AC Delco or NGK. Is one better than the other? Does anyone have the part numbers? Do you have to run the fancy platnum or iridium ones?
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Old 07-05-2012, 09:53 AM
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Go to your local auto parts place and get ac plugs for a truck 496, they are the same thing for around 7 bucks.
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Old 07-05-2012, 11:05 AM
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AC Delco 41-983 platinum plug.

Regards,
Ray @ Raylar
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Old 07-05-2012, 02:14 PM
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Thanks
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Old 07-16-2012, 02:43 PM
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any idea how often a 496 mag should need plugs?
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Old 07-16-2012, 05:32 PM
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Originally Posted by mittens
any idea how often a 496 mag should need plugs?
Maybe every 250-300hrs.
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Old 07-16-2012, 05:36 PM
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I have 250 now no issues.
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Old 07-23-2012, 12:03 PM
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what gap should I run with stock 496 Mags on those plugs?
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Old 07-23-2012, 01:46 PM
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335 hours on stock plugs in a 496 MAG built in 9/2003. Still starts and runs like a top.
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Old 07-23-2012, 02:46 PM
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out of 180 hours, 75 was at idel... so mine may be laoded mroe than normal.


still confuse what the guy that owned the boat before me did with it. bought it brand new, and sold it with 160 hours, 75 of that was idel....WTF> and with mufflers. haha
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