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Recommended plug heat range..

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Old Oct 6, 2009 | 10:25 PM
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Default Recommended plug heat range..

What spark plug heat range/part number/brand would be recommended for a 5.3 with 6.0 heads and (shooting for) 15psi? I'm just curious as to what people are running.
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Old Oct 7, 2009 | 01:52 PM
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Originally Posted by salemetro
What spark plug heat range/part number/brand would be recommended for a 5.3 with 6.0 heads and (shooting for) 15psi? I'm just curious as to what people are running.

I run an NGK 7317. It's a number 8. I've run that plug from 500 hp to 900 hp without issue.
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Old Oct 7, 2009 | 02:57 PM
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i actually run a NGK 10 now... i burnt the electrodes of my 7's. ill get the plug number if needed.
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Old Oct 7, 2009 | 09:49 PM
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I forgot to mention that I'm running the truck coils on this setup (the ones with the visible heatsink). Not sure if that matters?? Static comp is 8.5:1

Thanks for the input.

Last edited by salemetro; Oct 7, 2009 at 10:00 PM.
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Old Oct 7, 2009 | 09:52 PM
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im using ngk r5672a-8 it is a gasketed seat for my etp heads> they are fine on my daily driver but i am at 10.3:1 compression
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