Question about 2008 GMC Sierra 1500 2WD

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How are the spark plugs numbered

Nothing just want to know numbering sequence for spark plugs

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Firing order is ....1-8-4-3-6-5-7-2....Set park brake wear safety glasses and check engine while cold..Look at the 2 front spark plugs on the engine left and right side....The spark plug that is located closest to the front of engine will be #1 ....then behind it is #2 then 3 and 4....then same for the other side..5 6 7 8....Front to back....passenger side front to back should be 1234 and driver side should be 5678....

Posted on Dec 10, 2014

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The firing order, which should be cast into the intake manifold, for the chevy small block V8 is 1-8-4-3-6-5-7-2. The firing order is the numerical sequence in which the spark plugs are fired. The insertion position of each spark plug wire around the circumference of the distributor cap can be found according to a clock face. The insertion sequence determines the firing order. The firing order is followed clockwise around the distributor cap starting from the 6:30 position with the 6:30 position being the number one cylinder spark plug wire.
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Hi,
I don't know your engine size, but the link below is a picture of the GM small block firing order with distributor.
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http://www.classiccarauto.com/impala/how_to/images/distributor.png

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