SPDZ1 Upgraded LS Ignition Coil Harness – Sold Per Cylinder Head (One Side)

Upgrade your LS engine with the SPDZ1 Ignition Coil Harness, engineered with better-than-stock wiring for improved durability and performance. Whether you’re replacing a worn factory harness or preparing for an engine swap, this harness delivers reliability you can trust.

Built with factory-style connectors and weatherproof rubber seals, it ensures a secure, moisture-resistant connection for long-term use in demanding environments. Perfect as a replacement, an upgrade, or a spare to keep on hand for your LS project.

Key Features:

• Designed for GM LS engines

• High-quality wiring – stronger than OEM

• Factory-style connectors for plug-and-play fitment

• Weatherproof rubber seals for maximum protection

• Ideal for replacements, upgrades, or engine swaps

• Sold per cylinder head (per side)

Get the dependable performance your LS build deserves with the SPDZ1 Ignition Coil Harness.

Compatibility:

• Guaranteed fit with GM coils: D510C (12570616) and D514A (12573190)
• May also work with: D581 (12558693), D585, D513A (12570616), MSD 8287, 12619161

⚠️ Important: Always double-check connections to confirm fitment with your specific factory harness and ignition coils.