Re: Ping at WOT and high RPM

From: Mike Sykes (
Date: Thu Sep 06 2012 - 10:54:17 EDT

I went from NGK FR4 to NGK zfr6f-11. You'd think two ranges colder
would be excessive but this is what's recommended for 97+ 5.2L and 5.9L
Ram/Dakotas from what says.<<<

I run the zfr6f-11 in my 408. Some guys even run the zfr7f-11, which is one
range colder. I didn't notice a difference in the 7 vs. the 6, but I'm not
in a position to need a cooler plug (yet).

- miggity

00' stroked R/T CC
DMLer since 1996!

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