ngk plug part number

Swannyvill

BLOWN '01
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Unionville, NC
I have a different set of heads on my 01 now with the short spark plug threads. does anyone know the part number for the NGK TR6 plugs that would have a short thread?

Also with my old heads i believe my plug gap was .032". Should I still run .032" with boost between 15-18# on these ?

Thanks
 
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01yellercobra

AKA slo984now
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Cali
I've used the same plug number on my 01 heads, 03 heads, and current 04 9 thread heads. I want to say it's the 4177 part number. I would gap them at .030" and see how they act. I want to say I was at .030" when I was at 19psi.
 

Swannyvill

BLOWN '01
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779
Location
Unionville, NC
so there isn't a difference in size of the plug sticking out of the bottom of the head between the 9 thread and 4 thread heads?
 

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