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Discussion Starter · #1 ·
DOES anyone know what size thread is on an NGK A-8 spark plug. It takes a 1 inch deep socket to unthread it so im dont think its 18mm but it might be?????
Or has anyone helicoiled their head that takes this plug?

Thanks in Advance.
 

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Discussion Starter · #3 ·
HiOctane said:
Its a 18 mm plug,and you can heli coil it.
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yes thanks so much !!!!!!!!!!
I knew someone would know.
thanks again hioctane i will pick one up from bolt and nut supply tommorow
 
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