Best Spark Plugs??
Team Owner
Joined: Jul 2004
Posts: 30,045
Likes: 4
From: Danville Virginia
Why not use what the guys who built your car recommend .... AC Delco 41-985 which is a "newer" irridium plug (versus the platinum plug installed at the factory).
The plug comes correctly pre-gapped at 0.040 inches and can be bought from any parts store (Napa ... whatever ... ) just give them the Delco part number.
Also, you might want to consider a set of spark plug wires ..... if they've been on more than 50k miles they're probably getting brittle. The GM Performance Parts (GMPP) kit (part number 12495519) are a very good wire at a surprisingly low price. Order one kit, it contains all 8 wires.
The plug comes correctly pre-gapped at 0.040 inches and can be bought from any parts store (Napa ... whatever ... ) just give them the Delco part number.
Also, you might want to consider a set of spark plug wires ..... if they've been on more than 50k miles they're probably getting brittle. The GM Performance Parts (GMPP) kit (part number 12495519) are a very good wire at a surprisingly low price. Order one kit, it contains all 8 wires.
I've been very happy with this combo 
Chuck
