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spark plug for stock 502?

Old 03-11-2007, 12:34 PM
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Default spark plug for stock 502?

I'm wondering what kind of spark plugs to get for my 502 mag. Stock (rebuilt), carbureted.

I searched the forums and found references to a projected tip design providing the best results. There seem to be a lot of recommendations for the NGK BPR6FS or the BR6FS, and also for the a/c MR43TS

Should I go with an extended tip?

Will i have any issues with piston clearance?

Will I gain anything?
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Old 03-11-2007, 01:26 PM
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Yes, you can use the extended tip.

Also consider the A/C RapidFire part # 1
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Old 03-11-2007, 02:14 PM
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Champion RV12YC, AC MR43T or MR43TS, NGK BPR6FS. The plug basically goes in perpendicular to the piston so xtnd tip clearance is not an issue. .045 I believe.

Last edited by Pismo10; 03-29-2007 at 01:21 PM.
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Old 03-12-2007, 06:38 AM
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Thanks guys

I'll go with the projected / extended tip NGK or a/c
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Old 03-12-2007, 07:15 AM
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I dont know if the BR6FS is extended or not. If not, I dont know the extended's model number.
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Old 03-12-2007, 07:38 AM
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from other threads, the only difference between the NGK BR6FS and BPR6FS is that one is extended. I think the "P" stands for projected (extended) but i'll double check before I buy the plugs.
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