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Anyone Know The Spark Plug Gap

4.8 liter engine

Anyone Know The Spark Plug Gap

Postby TucsonJoe [OP] » Nov 17 2011, 4:25am

Hello All, I'm looking to replace my spark plugs with some GM Iridiums but I can't find any spark plug gap info.... Anyone have any idea's
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Re: Anyone The Spark Plug Gap....

Postby EKinMN » Nov 17 2011, 4:52am

The gap for a 2007 Silverado, with the 4.8L engine is 0.040 inches. In fact, it's the same for all engines with the exception of the 4.3 and 8.1 liter engines. It's on page 610 of your manual.
Also, irridiums come pre-gapped. You should not have to change it. If you decide to mess with it, know that the electrode is fairly brittle, so be very careful if you are verifying or adjusting the plug.
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Re: Anyone Know The Spark Plug Gap

Postby druwevr » Mar 15 2012, 1:58am

yep .040
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Re: Anyone Know The Spark Plug Gap

Postby scottja » Mar 15 2012, 2:05am

If you get AC delco irridiums make sure you check the gap out of the 8 I got only 5 had a .40 gap the others had to be gaped.
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