Spark Plug Recommendation #5 355

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July 11th, 2014, 01:11 PM

#1

HWYSTR455

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Location: Manassas, VA

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Spark Plug Recommendation #5 355

Looks like the plugs I'm running, AC R43S, are a touch too warm, and looking for a slightly colder plug. Rare I've ever had to drop below a 43 on a street/strip car, but here I am. Any recommendations please?

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July 12th, 2014, 04:13 AM

#2

Seff

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I used to run AC R45S for whatever that's worth, with my points setup, and never had problems.

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July 12th, 2014, 10:47 AM

#3

olds 307 and 403

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I plan on running NGK 5670-8 plugs with my ported #6 heads, 9.6 to 1 and a smallish 204/214 cam. Mine will be street/strip also. Just need to get the swap done

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July 13th, 2014, 09:46 AM

#4

Smitty275

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Hard to believe you need to co colder than that on a street machine. Are you sure your not a bit on the lean side or too much ignition advance?

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