Spark plugs, help!

TF says an FR5 ngk is what my heads use. Its a 3/4" reach, projected tip, gasketed plug, 5 heat range.

I'm running a 19mm reach, non projected tip, gasketed plug, 6 heat range.

I switched from a br6es to a br6es-11 only difference is one is 3/4" reach, other is 19mm. The br6es is hard to get locally. Both have same issue.


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Originally Posted by shownomercy

Gonna have to disagree with you on that, BLS runs 80# and tight, ~.035 plugs with his F1a car and they are not black.

It sounds like a tune issue if your other parts check out mechanically.

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Interesting. Also interested in how he's getting away with a .035 gap. That's pretty damn good for his boost level.

Posted from my Rooted and ICS'd Rezound

Sent slammed98gmc an email asking about plugs. He runs rhe same heads as fastbird and I.

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I run GM R42LTS's. They seem to handle a beating gapped at .035 as mentioned.

19mm (0.748") is, for all practical purposes, the same as 3/4" (0.750")

I figured since the 3/4 and 19mm sockets were so close it shouldn't matter but I've been wrong before lol.

Any suggestions? You're a smart dude.

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