Correct gap for TR55 IX Iridium plug?
Thread Starter
Burning Brakes
Joined: Mar 2004
Posts: 842
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From: Corpus Christi TX
St. Jude Donor '05
Correct gap for TR55 IX Iridium plug?
Purchased a set of NGK iridium plugs and I am finding conflicting information about the proper gap. Is there a definitive gap for a 2000 6-speed? Thanks!
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Joined: Oct 2010
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From: Jonesboro, AR
Race Director
Joined: Apr 2007
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From: South Western Ontario
0.040"
The platinum were 0.060" but GM released a bulletin to change to 0.040" with the iridums. You can find iridiums specified for the car pre-gapped at 0.060" but they have been done wrong and whoever picked the gap missed the GM update.
Peter
The platinum were 0.060" but GM released a bulletin to change to 0.040" with the iridums. You can find iridiums specified for the car pre-gapped at 0.060" but they have been done wrong and whoever picked the gap missed the GM update.
Peter
Team Owner
Joined: Mar 1999
Posts: 22,025
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From: At the beach in little Rhody
With the NGK plugs, the second digit is the gap. If you want a narrower gap, you need to look for TR5 IX, if they make it. The first digit is heat range, the second is the gap. NGK has/had a very good catalog available for download that explained their plugs, part numbers, etc.
