Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
⚠️ California Proposition 65 Warning : Some products sold on this website may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
For more information, visit www.P65Warnings.ca.gov.
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.
Yes, we offer free standard shipping on all orders within the United States.
When will I receive my item?
Domestic orders typically arrive within 3-5 business days. Delivery times are estimated and may vary depending on your location, weather conditions, or other unforeseen factors.
Can I change or return my item?
We hope you love your purchase, but if you need to make a change or return your item, we’ve got you covered! You can initiate a return or exchange within 30 days of receiving your order. Please ensure the product is in its original condition and packaging. For more information on our return policy, please visit our Returns & Exchanges page.