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Spark Plugs

2K views 3 replies 2 participants last post by  The Mad Porter 
#1 ·
I built a 13:1 compression Dove headed 466 to drag race. I called NGK for a plug recommendation and they said I needed a 7909 which is a 8 on the heat range. But it won't go in the head because of it not being a tapered seat. NGK says they don't make a plug for me so who does or how do I get the right heat range recommended by the machinist and NGK?

 
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#2 ·
Go here to get an adapter to allow the use of 3/4" reach gasketed plugs in the early heads:


Products


The kind you need is not shown. Contact and ask for a 18mm tapered seat to 5/8" hex, 14mm, 3/4" reach plug with gasket.





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