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Old May 1, 2008 | 11:25 PM
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Default Urgent! Please Help.

ok, i just bought NGK TR55IX iridium spark plugs from the auto zone. the problem is that all of them have .056-.057 gap???

i thought for CORVETTE ITS SUPPOSE TO BE .044 JUST LIKE THEY HAVE ADVERTISED IN MARYLANDSPEED.COM

what should i do? return it or thats how its suppose to be?
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Old May 1, 2008 | 11:38 PM
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check your owners manual on gap
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Old May 1, 2008 | 11:49 PM
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A given part number spark plug is made for many cars - not just your vette. You have to gap them for your application. Buy a gapping tool from from Auto Zone and gap them yourself.

It's normal.
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Old May 2, 2008 | 12:04 AM
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i thought iradium came pre-gapped. but i just went running and bought me a gap-mesurer to gap them. so, what should i gap them to?
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Old May 2, 2008 | 04:53 AM
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Originally Posted by SANJU100
i thought iradium came pre-gapped. but i just went running and bought me a gap-mesurer to gap them. so, what should i gap them to?
From the 2007 Owners Manual:

.040 inch
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Old May 2, 2008 | 08:42 AM
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Several sites sell the same PT#'s we do for all LSx engines. I think the assumption is that you will gap them. I actually did not gap them for my GTO, and they work fine.
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Old May 2, 2008 | 09:53 AM
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First you should always check the gap on plugs before installing them; I have seen quite a variance in plug gap from plugs in the same box.

There are a few threads that cover those very plugs, the gap range is between .060 and .040.

JR
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Old May 2, 2008 | 10:47 AM
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i gap my NGK TR 6's at .045. It's a N/A motor. It it were blown they'ed be gaped at .035
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Old May 2, 2008 | 10:50 AM
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Originally Posted by SANJU100
ok, i just bought NGK TR55IX iridium spark plugs from the auto zone. the problem is that all of them have .056-.057 gap???

i thought for CORVETTE ITS SUPPOSE TO BE .044 JUST LIKE THEY HAVE ADVERTISED IN MARYLANDSPEED.COM

what should i do? return it or thats how its suppose to be?
Per the NGK website, http://www.ngksparkplugs.com/part_fi...uv/results.asp

.040 inch.
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Old May 2, 2008 | 11:07 AM
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you guys are outstanding!!! i am going with .041. why? its simple. all the web-site that sells the same spaskplugs says the gap should be .044. but corvette sparkplugs came with .040. so, just wanna be in-between.
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