Spark Plug Recommendation #5 355

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Jul 11, 2014 | 01:11 PM

HWYSTR455

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Registered User

Joined: Jul 2006

Posts: 694

From: Manassas, VA

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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Jul 12, 2014 | 04:13 AM

Seff

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Joined: Feb 2011

Posts: 1,591

From: Denmark

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

Jul 12, 2014 | 10:47 AM

olds 307 and 403

Out of Line, Everytime😉

Joined: Dec 2006

Posts: 10,108

From: Melville, Saskatchewan

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