4) Spark Plugs - Change out those stock spark plugs with new ones to restore any lost power. Brands that most WBody owners tend to go with are either Copper Core Autolites or NGK Spark Plugs. Get these at your local auto parts store also. Others can chime in if they use something else. They range as follows in order from hottest to coldest plugs...remember...you want the hottest spark possible...so running a super cold plug on a larger pulley to combat knock isn't the best plan...ACD's, AL606's, and AL605's are basically for stock cars or very small bolt ons still running the stock S/C Pulley or modded N/A guys...you want to keep a hot spark. NGKTR55/AL104's for your 3.4" Setup, TR6's are a tad cooler...best used around the 3.25" pulley area, and AL103's...are for the extreme supercharged application...3.0" pulley or lower.
AC Delco Factory Replacements: Stock
Autolite 606: Stock
Autolite 605: 1 Heat Range Cooler
NGK TR55: 1 Heat Range Cooler
Autolite 104: 2 Heat Ranges Cooler
NGK TR6: 2 Heat Ranges Cooler
Autolite 103: 3 Heat Rangles Cooler
5) Spark Plug Wires - If you need some new wires, opt for the stock Lifetime Warranty Auto Parts store brand from your local auto parts store, but if you want to upgrade and need new wires now is a great time. Coil Packs, leave the stock ones...don't waste your money on MSD's as they are actually proven to fail within a years time and put out LESS spark than stock units. Companies that offer aftermarket plug wires are MSD Ignition, Taylor Wires, and PRJ Performance. All ranging from 8mm to 10.4mm monster wires. Cost: $60-$120
