Firecore 50 8.5mm plug wires are a great upgrade for any LS1 needing better spark. The Firecore50 line benefits even a stock engine and can be found on 1000+hp applications as well. These Firecore plug wires are a direct fit for Chevrolet LS1 and similar LS engines. These are longer than car fitment to suit LS truck layout such as LQ9 4.8 5.3 6.0
