I too have the P-heads and I want to throw an new set of plugs in it.  I don't run N2O, but would like to know what spark-plug I should be running and what it should be gapped at.  Anyone know??? 
 
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Eric - 89 Mustang LX coupe 
302 - Cobra Intake - GT40p heads - TFS stage 1 cam - FRPP 1.6 roller rockers - Naturally Aspirated 
3:73 gears - KYB shocks and struts - Eibach springs - HPM Mega-bite Jr lower control arms - HPM upper control arms 
		
	
		
		
		
		
		
		
		
		
		
	
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