This vehicle should have platinum fine tip or iridium plugs, neither need a gap setting
It is right after the 4th spark plug on drivers side
The radiator drain plug on a 1989 Chevy C1500 Silverado is on the bottom of the radiator.
"Where is the oil plug located for a 2008 Chevy silverado ext cab?"
gap is 0.60,
Try this link: http://www.etrailer.com/faq_cbc.aspx
That would be the 3ed spark plug from the front of the head on the drivers side.
0.060 in
0.060 Plug gap.
Yes.
It will be in the bottom of the oil pan.
0.035
.060