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Old 11-14-2005, 11:51 PM   #1
76bonanza
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ngk plugs

Those running NGK's what plug number are you running mild built 350 with HEI and power coil?

Thanks

I am looking at running the UR4(6630)
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Old 11-15-2005, 08:46 AM   #2
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Re: ngk plugs

anyone
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Old 11-15-2005, 09:22 AM   #3
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Re: ngk plugs

YR5 's 7052 or 7062 i think
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Old 11-15-2005, 12:19 PM   #4
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Re: ngk plugs

they list the 7052 as heavy duty and the 6630 as light duty wonder what the difference is?
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Old 11-15-2005, 12:49 PM   #5
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Re: ngk plugs

Correct me if I am wrong, but I think the duty is the heat discharge rating of the plug.....isn't that wright?
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Old 11-15-2005, 01:07 PM   #6
76bonanza
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Re: ngk plugs

I dont know they ask like 5.7 light duty or 5.7 heavy duty. Just wondering if by heavy duty they mean towing and such and light duty as daily driver to work and stuff.
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