Spark plugs, help!

[Ryan Stout]

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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[Fastbird]

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.

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

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[Ryan Stout]

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

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[blackbirdws6]

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

[Injuneer]

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

[Ryan Stout]

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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