Spark plugs 502 MAG MPI
08-14-2004, 11:17 PM
#1
AT Cult Member #3
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Spark plugs 502 MAG MPI
What type of spark plugs do you use in your 502 MPI? I am replacing the AC Delco Rapidfire#1 that have been in my boat for 150 hours 
OE plugs were NGK. They don't look to bad for being in there for that amount of time...
OE plugs were NGK. They don't look to bad for being in there for that amount of time...
08-14-2004, 11:42 PM
#2
Charter Member #1171
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Re: Spark plugs 502 MAG MPI
I always ran the Rapid Fire,, had good luck with them.
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08-15-2004, 12:09 PM
#4
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Re: Spark plugs 502 MAG MPI
Try the AC MR43TS - extended tip, same priciple at the rapid fire with half the price. I use them in all of my boat motors. Supercharged 454 and twin 502s.
