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What spark plugs in a 408?

   
Old May 14, 2009 | 12:05 AM
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Default What spark plugs in a 408?
Wondering what plugs to go with in a 408. Not doing FI or Nitrous. I think Compression will be 10.5 or 11 to 1. Thanks!
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Old May 14, 2009 | 04:17 AM
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NGK TR55's are good.
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Old May 14, 2009 | 08:52 PM
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I suggest TR6s gapped@.045". Once you are making a decent amount of power over stock, it's time to go to a colder plug.
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Old May 15, 2009 | 06:53 PM
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im using tr55
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Old May 16, 2009 | 11:38 AM
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TR6 for sure. Part number should be a 4177.
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Old May 16, 2009 | 09:20 PM
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I am installing my 408 and am going to use TR55s for now. I am going to reuse my MS3 and PRC heads for now. But when I go bigger than that I am jumping to TR6s then. You should be straight unless you have a monster set of heads and massive cam.
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Old May 16, 2009 | 10:34 PM
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I went with the TR6 in my new 408. I had the 55s in my 347. No big deal to put them in now.
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Old May 17, 2009 | 01:12 AM
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I'm also running TR-6's but i'm running 12:1 compression in mine.I think with your setup TR-55's would be fine, but I doubt you'd be hurting anything running the 6's
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