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Advantage 575 08-24-2011 09:54 AM
Spark Plugs
 
Need help with a spark plug choice. I have 540's with 871's and EFI. Motors are dialed in but are rough on plugs. Heads are Dart pro 1's and currently running NGK -8's. What's a good plug to run in Blown engines. Thanks

Rookie 08-24-2011 10:17 AM
Use NGK 5671A-7. The stocking item # 4091. I just put these in my new PRO1's after reading Eddie Youngs post.


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