Spark Plug Range & Gap W/Higher Compression?

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Spark Plug Range & Gap W/Higher Compression?

Post  Maxx Levell on October 9th 2012, 11:54 am

I've just changed compression ratio with a new set of pistons. Went from 10:1 with flat tops to 13:1 with the new set. This is a 347 stroker with AFR heads running on E85. I was running a NGK -7 series plug with .030 gap, and am wondering if I need to change plug range and gap with the higher compression. Only a couple of weekends left here to run, and I'd like to be able to get close out of the gate. Hoping to hit the ground running this weekend for Hardinsburg.

Thanks for any help...!
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Re: Spark Plug Range & Gap W/Higher Compression?

Post  cool40 on October 9th 2012, 10:20 pm

i'd use a NGK-9. Smile
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