spark plug type

Old 09-10-2010, 03:03 AM
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rich970
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Default spark plug type

i have 440-1 indy heads 15to 1 comp flat top pistons. i was wondering can i use a extended tip plug. i use ngk R5671A-9 was wanting to try a R5672 Series plug. Thanks
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Old 09-14-2010, 08:56 PM
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mopar1968
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No do not use extended type plug, I use RJ12YC Champion in mine :!: Extended tip might hit piston :!: JMO Mark
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Old 09-15-2010, 05:32 AM
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rich970
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thanks Mark . i should have said projected tip plug ? do you use the rj12yc in the Indy heads ?
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