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I have a 347 stroked 11:1 comPression with victor jr heads, it's a drag car what spark plugs should I run in it? I know they have to be 14mm x .75 reach but what exact plug? I really like NGK if anyone knows what heat range/part number I'd apPreciate it
 

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What Mark said and if it's a NA car then you could use the Autolite 3924 which is a great plug. If you want NGK see what is equivalent

Spark plug cross reference
 
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