MSD 5560 Street-Fire Spark Plug Wire Set for Big Block Chevy 454 HEI

The MSD 5560 Street-Fire Spark Plug Wire Set is a direct-fit, pre-terminated ignition wire set engineered for 1974–1976 Big Block Chevrolet 454 engines equipped with factory HEI distributors. Featuring an 8mm spiral-core conductor wrapped in a durable black silicone and synthetic jacket, these wires deliver reliable spark transfer while suppressing electromagnetic and radio frequency interference that can disrupt engine electronics.

The wires route over the valve covers and terminate with straight spark plug boots and a 90° male HEI distributor boot — matching the factory routing and terminal configuration of the BBC 454 HEI setup. Heavy-duty terminals ensure a solid, corrosion-resistant connection at every cylinder.

Key Features:

• 8mm silicone and synthetic jacket resists heat and abrasion for long service life
• Helically wound spiral-core conductor suppresses EMI/RFI noise for cleaner ignition signal
• Kevlar core combination provides exceptional strength and durability
• 507 ohms per foot resistance for improved spark delivery and power output
• Heavy-duty terminals for secure, reliable connection at plug and distributor
• Black silicone boots protect terminals from high exhaust heat
• Distributor boot: 90° HEI male post
• Spark plug boots: Eight straight
• Coil wire not included

MSD Street-Fire wire sets are inspected and tested to MSD's engineering standards, making them a trusted upgrade or direct replacement for stock BBC HEI ignition wiring. Legal for use on emissions-controlled and non-emissions-controlled vehicles.