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Old 11-06-2012, 02:43 AM
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any blower/nitrous guys running ngk 5671a-11

Currently im running the -9. Does anyone see any differance in the 9,10,11 cold plugs?
The -9 is already a really cold plug. I have mine gapped at .25.
I have a 427bbc 8.75 compression forged piston running a 8-71 with 7lbs of boost.
I have a msd6al, and 2 850,s on top. Should i stick with the -9 or go as cold as possible and run the -11. This is a all out drag car.

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Old 11-06-2012, 08:19 AM
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What type of problems are you having? Was it stumbling or knocking under throttle. Or just preparing for the hot days of summer.

Hotter plugs are better if you can run them without knocking or pre-ignition.
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Old 11-06-2012, 11:23 AM
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No problems yet, i have not takin it to the track with the 8-71. just curious if i should go to the coldest plug when running 7lbs of boost.
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Old 11-06-2012, 09:37 PM
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We run NGK 5671 -10 on the blown alky 565 BBC we run 40+ pounds of boost via the PSI 14-71 Hi-Helix blower.
I don't think you need that cold of a plug.
Are you having any problems with detonation?
How much total timing are you running, what fuel?
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