spark plugs when over 400whp????..NEED to stay with Iridium???

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May 31, 2012 | 03:13 PM

05rs1

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spark plugs when over 400whp????..NEED to stay with Iridium???

Just would like to kno what are the best spark plugs to run when making over 400+hp. Do we NEED to stay with Iridium plugs? What should the gap be??? I know tighter than stock....thanks

May 31, 2012 | 04:49 PM

tom0613

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U don't have to use iridium but if u do I would use a two step colder plug

Jun 1, 2012 | 12:08 AM

borderguy881

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I always have ran copper plugs on mine and yea 400 whp a 2 step colder is very much advised

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