Need some help on a plug recommendation (non-ls but nitrous fed)
08-02-2011, 09:31 AM
#1
Need some help on a plug recommendation (non-ls but nitrous fed) I have a 406 SBC with 11.6:1 comp. and AFR heads. AFR recommends a 3910 and I need a plug 2 steps colder. I cannot seem to find a cross reference for a plug 2 steps colder plug. I would like to use an NGK instead but if all that can be had is an Autolite I will just get that.
When i had the motor dyno'd the engine builder put in NGK R5671A-9. The equivalent to the 3910 AFR recommends in NGK is a R5672A-9. I really don't know the difference between the 2 with that 1 digit being different.
I just need to know what plug to get that is 2 steps colder so I can spray this thing. Thanks guys.
When i had the motor dyno'd the engine builder put in NGK R5671A-9. The equivalent to the 3910 AFR recommends in NGK is a R5672A-9. I really don't know the difference between the 2 with that 1 digit being different.
I just need to know what plug to get that is 2 steps colder so I can spray this thing. Thanks guys.
08-02-2011, 10:52 AM
#2
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I have a 406 SBC with 11.6:1 comp. and AFR heads. AFR recommends a 3910 and I need a plug 2 steps colder. I cannot seem to find a cross reference for a plug 2 steps colder plug. I would like to use an NGK instead but if all that can be had is an Autolite I will just get that.
When i had the motor dyno'd the engine builder put in NGK R5671A-9. The equivalent to the 3910 AFR recommends in NGK is a R5672A-9. I really don't know the difference between the 2 with that 1 digit being different.
I just need to know what plug to get that is 2 steps colder so I can spray this thing. Thanks guys.
When i had the motor dyno'd the engine builder put in NGK R5671A-9. The equivalent to the 3910 AFR recommends in NGK is a R5672A-9. I really don't know the difference between the 2 with that 1 digit being different.
I just need to know what plug to get that is 2 steps colder so I can spray this thing. Thanks guys.
877-473-6767 EXT. 2
The NGK is a much better plug than the equivalent autolites for tuning.
08-02-2011, 02:51 PM
#4
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