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jmeng

07-05-2012 09:50 AM

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?

checkeredpast

07-05-2012 09:53 AM

Go to your local auto parts place and get ac plugs for a truck 496, they are the same thing for around 7 bucks.

Raylar

07-05-2012 11:05 AM

AC Delco 41-983 platinum plug.

Regards,
Ray @ Raylar

jmeng

07-05-2012 02:14 PM

Thanks

mittens

07-16-2012 02:43 PM

any idea how often a 496 mag should need plugs?

Griff

07-16-2012 05:32 PM

Quote:

Originally Posted by mittens (Post 3731405)

any idea how often a 496 mag should need plugs?

Maybe every 250-300hrs.

Pwraddr

07-16-2012 05:36 PM

I have 250 now no issues.

mittens

07-23-2012 12:03 PM

what gap should I run with stock 496 Mags on those plugs?

Knot 4 Me

07-23-2012 01:46 PM

335 hours on stock plugs in a 496 MAG built in 9/2003. Still starts and runs like a top.

mittens

07-23-2012 02:46 PM

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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