MSD 5540 Street-Fire Spark Plug Wire Set Ford HEI - 351W 400 460 8mm Black

The MSD 5540 Street-Fire Spark Plug Wire Set is a direct-fit, pre-terminated ignition wire set designed for Ford 351W, 351M, 400, and 460 engines equipped with an HEI-style (male post) distributor cap from 1977 and up. Engineered by MSD to deliver high performance at an exceptional value, these wires provide reliable spark delivery in a durable, street-ready package.

Key Features:

• 8mm diameter silicone and synthetic outer jacket resists heat, abrasion, and engine chemicals
• Helically wound spiral-core conductor suppresses EMI/RFI (electro and radio frequency noise) for cleaner ignition signal
• 500 ohms per foot of resistance for improved spark delivery and power output
• Kevlar/Aramid core combination provides exceptional strength and long-term durability
• Silicone boots protect terminals against high exhaust temperatures and engine heat
• Heavy-duty terminals ensure a secure, corrosion-resistant connection at plug and distributor ends
• Distributor end features 90° HEI male post boots; spark plug ends feature straight boots
• Coil wire included — sold as a complete set
• RFI suppression: Yes
• Wire color: Black; Boot color: Black
• Emissions legal — legal for sale and use on emissions-controlled vehicles (Holley/MSD Emission Code 5)
• Backed by MSD's one-year warranty

The MSD Street-Fire line delivers performance-grade ignition components without the premium price tag. These plug wires are inspected and tested by MSD engineers to ensure consistent quality and reliable spark delivery across all eight cylinders.