Quick spark plug question

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Aug 1, 2010 | 10:06 PM

jimbo98z

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Quick spark plug question

I'm about to do heads/cam/intake/fuel etc. on my Z28 and I'm wondering about if I will need to do anything different in terms of plugs. Compression will be up to 11.0:1, running N/A on pump gas. I have been using TR5's gapped to .040.

May be kind of a dumb question, and I don't think I need to change anything, but I figured I would ask.

And I did search

Aug 1, 2010 | 10:08 PM

180ls1

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that might be a little cold for N/A but i bet you would be fine, i run the 55's but i am no expert.

Aug 2, 2010 | 11:09 AM

SOMbitch

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My tuner suggested I go one step colder when my milled TFS heads bumped me to 11.3-1 so TR6's here.....

Last edited by SOMbitch; Aug 2, 2010 at 09:21 PM.

Aug 2, 2010 | 03:53 PM

Viper

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The TR5's and TR55's are the same plug (heat) with different gaps. You shouldn't try and bend a 55 to .040, thus why they make the TR5. Anyway I went to a TR6 4 years ago and like them, gapped at .039 11:1 compression. I ran TR5's gapped at .040 for about a year, car idles better (for me) with the TR6.