MSD - Street Fire Igntiion Coil Dual Connector, Red, GM HEI distributors Coil Spring - Conventional -

Coil Spring - Conventional - 5 in OD - 11 in Length - 225 lb/in Spring Rate - Rear - Steel - Black Powder Coat - Each

125 in OD - 24

Intake Manifold - Square Bore - Dual Plane - Oval Port - Aluminum - Natural - Big Block Chevy - Each

They feature a heavy-duty

allowing you to easily convert your 4500 equipped 800+ horsepower dragster or door car

MSD - Street Fire Igntiion Coil Dual Connector, Red, GM HEI distributors Coil Spring - Conventional -GM Dual connector coils mount directly in place of the factory coils and accept the factory connectors. Spark energy is increased thanks to improved materials and windings that were spec'd by MSD engineering.