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Plug gap for PRC 2.5 5.3 heads stock cubes?

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Old 02-12-2008, 06:20 PM
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Default Plug gap for PRC 2.5 5.3 heads stock cubes?
Anyone have a clue what gap I should use when I install these heads? I'm using the NGK iridiums.
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Old 02-12-2008, 06:27 PM
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I used the tr55s at the gap they come with. I think they are gapped at .055.
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Old 02-12-2008, 07:14 PM
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Originally Posted by mchdg86
I used the tr55s at the gap they come with. I think they are gapped at .055.
x2 here...
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Old 02-12-2008, 08:16 PM
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.040"
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Old 02-12-2008, 10:19 PM
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Iridiums come already gapped. GM had a TSB not to touch them.
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Old 02-13-2008, 01:26 PM
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I ran TR6s gapped at .036 in my CETA but I also had the MS3
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Old 02-13-2008, 04:49 PM
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Originally Posted by LS1HIGHLIFE
Anyone have a clue what gap I should use when I install these heads? I'm using the NGK iridiums.
Unmilled stock gap .055
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Old 02-13-2008, 05:59 PM
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.055 worked great for me on my car
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Old 02-13-2008, 06:05 PM
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Originally Posted by 01 BERGER CAMARO SS
.055 worked great for me on my car
What numbers did your 99 bird throw down? Track times?
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