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spark plugs 454mpi procharged

Old 06-18-2008, 01:43 AM
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Default spark plugs 454mpi procharged

i know questions like this are always asked but ive gone back and forth and cant seem to fine the answer. I have a 1999 454 mpi 310 hp motor thats super charged procharger whats the best plugs to run? I bought the iredium plugs and over all it runs great but at idle it has a slight hesitation and i thanks think its from the plugs maybe not but im going to start there since i didnt have that problem before i changed them. so any guys with super chargers your input would be great thanks also whats a good prop size 1999 donzi 22zx currently running a 25 labbed 4 blade running aprox 78 mph

454mpi jacobs ignition dana headers procharged 5lbs of boost reprogramed ecu larger fuel injectors all work done at arz speed and marine
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Old 06-18-2008, 08:04 AM
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Like to help,,,, but I cant get past your avatar !!!

Drop to a colder plug ,,, either A/C MR42T, or NGK BR8FS
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Old 06-18-2008, 08:05 AM
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If AZSM did it ask them. I run MR42t's. (AC).
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Old 06-18-2008, 05:36 PM
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they no longer have mr42t but they have r42t the only difference is that there non marine thanks
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Old 06-19-2008, 08:39 AM
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That's what i'm running. I lied about the MR part.
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Old 06-21-2008, 07:00 PM
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bought the rapid fires lets see how they run !!
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