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Discussion Starter · #1 ·
I'm looking for ideas on which spark plug and how much gap?
My motor is a 289, TRW pop-up pistons approx 11.5 to 1 compression, 69 351 heads and a Dura-spark distributor.
Roger
 

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.040~.045 if it's the full Duraspark setup.
 

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Discussion Starter · #4 ·
Thanks, it's a Duraspark with a MSD.
 
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