502 carbed spark plugs
04-09-2003, 07:01 PM
#1
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502 carbed spark plugs
I need some help please! I just purchased a used 97 baja boss with a built 502. Im going to do a tune up here soon and want to know what spark plugs are best for this application. It is a performance built engine close to the 500HP(?) specs, around 500 hp and 575 lbs-ft and has a carb. The plugs that are in it are Champion RV15YC4 and look to have worn normally. Any one with a carbed 502 out there have any suggestions? that would be great. thanks Derrick
04-09-2003, 07:14 PM
#2
Not sure with your application, but i've had real good luck with Bosch Platinums in mostly stock engines.I use them in everything i own.
Found a conversion chart that list all brands if you need it.
Found a conversion chart that list all brands if you need it.
04-10-2003, 03:44 PM
#4
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Originally posted by Griff
AC Rapid Fire #1's worked very well for me.
AC Rapid Fire #1's worked very well for me.
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08-05-2004, 11:28 AM
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Re: 502 carbed spark plugs
Originally Posted by convincor
Not sure with your application, but i've had real good luck with Bosch Platinums in mostly stock engines.I use them in everything i own.
Found a conversion chart that list all brands if you need it.
Found a conversion chart that list all brands if you need it.
08-05-2004, 12:24 PM
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Re: 502 carbed spark plugs
A MR43T is a very popular marine plug. I too run the platinums in my street vehicle, but I havn't been able to cross reference to a marine plug. The MR's have a stainless body so they won't corrode.
08-05-2004, 03:17 PM
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Re: 502 carbed spark plugs
DENNIS IF THE ENGINE HAS GM IRON HEADS OR EVEN MERLINS WHAT I USE HERE AT THE SHOP ARE NGK YR5 THIS IS THE PLUG I USE EXCLUSIVELY AND WE BUILD ABOUT 2 ON A MONTHLY BASES WITH NEVER A PROBLEM WITH THAT PLUG. HOPE THAT HELPS LAZ MESA WWW.MESABALANCING.COM,
08-05-2004, 08:15 PM
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Re: 502 carbed spark plugs
Those Champion plugs will work just fine. They have an extended tip so they will not foul easily if you do a lot of idling. I have them in my 502 and they work great. I doubt if a more expensive plug will make any difference in how it runs.
08-06-2004, 12:57 AM
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Re: 502 carbed spark plugs
What about plugs for aluminum heads.I have to use the ones with the small hex or I can't get a plug wrench on them.Even with the small hex I had to make a custom machined down socket with a universal tig welded to it.I have used champion rc12yc an ac fr3ls.I like to change my plugs a couple times a season just to monitor whats happening in the engine.I have not had any real complaints with either plug.I would like to try a colder one because after a hard run I sometimes get a bit of run on at shutdown.
