In many automobile engine configurations, a spark plug socket is the only way you will ever get at the plug. But even in situations whee the hex on the plug is easily accessible (lawnmower, for example) a spark plug socket is still the best way to remove it without damage to the plug.
chevron super with 93% octane
ACDelco R45S conventional spark plugs for an original ignition system.
A 2004 Chevrolet Trailblazer that has a 4.2 liter engine will have a spark plug gap of .044 inches. The best spark plugs for this vehicle are iridium spark plugs.
A/C delco
DENSO K16R-U11 or NGK BKR5EYA11
Ngk bpr5ey
platnum brand works really well and improvesgas mileage
NGK makes fantastic plugs that produce excellent spark for your engine.
A/C Delco and put the # in it that it calls for from the factory.
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I would say go with ngk platinums or ngk irridiums.