Convert your Chevrolet LS-based V8 to D581 square truck coils with this premium billet aluminium coil bracket set, precision CNC-machined from aircraft-grade 6061-T6 aluminium for permanent durability and a clean engine bay aesthetic. The factory LS coil-on-plug locations are restrictive in terms of coil choice — and many LS enthusiasts upgrade to GM D581 / 12558693 truck coils for their superior spark energy, durability, and significantly improved high-RPM ignition performance compared to the factory pencil coils. This bracket set provides the necessary mounting solution to relocate D581 coils to a properly aligned position on the LS valve cover, repositioning the coils 1-1/8" down toward the center of the valve cover for optimal clearance and a clean professional installation. The result is dramatically improved ignition performance for built and boosted LS applications, with the rugged truck coil reliability that the LS performance community has trusted for decades.
Features:
- D581 square coil conversion enabler – allows direct fitment of GM D581 / 12558693 truck coils to LS-based engines for superior ignition performance
- Premium 6061-T6 billet aluminium construction – aircraft-grade aluminium delivers exceptional strength, lightweight performance, and long-term durability
- CNC machined precision – manufactured to exacting tolerances for clean, professional installation
- Anodized surface finish – delivers added corrosion resistance and a sleek aesthetic that adapts well to any weather conditions
- Optimal coil positioning – relocates D581 coils 1-1/8" down toward the center of the valve cover from factory coil locations for proper clearance and clean engine bay routing
- Direct OE truck coil compatibility – designed specifically for D581 / 12558693 ignition coils widely used across the GM truck and SUV lineup
- Wide LS engine compatibility – fits the entire LS-based small block V8 family across multiple displacement variants and model years
Specifications:
- Condition: 100% Brand New
- Type: D581 Square Coil Mounting Bracket Set
- Material: 6061-T6 Billet Aluminium (Aircraft-Grade)
- Construction: CNC Machined
- Surface Finish: Anodized
- Coil Positioning: 1-1/8" downward offset from factory coil locations
- Quantity: 1 complete bracket set per pack
- Position: Atop LS Engine Valve Covers
- Coil Compatibility: GM D581 / 12558693 Truck Coils
- Purpose: Coil Upgrade Conversion / Performance Ignition Mounting
Fitment:
LS-based Gen III / IV small block V8 only. Not compatible with LSA or LS9 valve covers.
- Chevrolet 5.7L / 350 V8 (1997 – 2004) – Gen III / IV LS-based
- Chevrolet 5.3L / 325 V8 (1999 – 2014) – Gen III / IV LS-based
- Chevrolet 4.8L / 294 V8 (1999 – 2014) – Gen III / IV LS-based
- Chevrolet 6.0L / 364 V8 (1999 – 2014)
- Chevrolet 7.0L / 427 V8 (2006 – 2014)
- Chevrolet 6.2L / 376 V8 (2008 – 2014)
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NOT compatible with LSA or LS9 valve covers – verify your engine variant before ordering
- Confirm engine code, displacement, and valve cover configuration before ordering
Coil Compatibility Notes:
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D581 / 12558693 Coils: Direct fitment with no additional hardware required
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D510C Coils: Compatible with this bracket set, but requires an additional spacer kit (sold separately) for proper clearance
Contents:
- 1x Square Coil Bracket Set
- All necessary mounting hardware included
Benefits:
- Enables D581 truck coil upgrade – widely regarded as one of the best ignition upgrades for LS-based engines, particularly for built and boosted applications where the factory pencil coils run out of spark energy
- Significantly improved spark energy and high-RPM ignition performance compared to factory LS pencil coils – critical for cammed, boosted, or high-compression LS builds
- Improved ignition reliability under sustained high-output operation – D581 truck coils are renowned for their robust construction and resistance to ignition breakdown under load
- Optimal coil positioning – the 1-1/8" downward offset toward valve cover center provides proper clearance for hood closure and clean wiring routing
- Aircraft-grade billet aluminium construction delivers OEM-grade fitment quality and permanent durability for installation that lasts the lifetime of the engine
- Anodized finish maintains the premium aluminium appearance over long-term outdoor and engine bay heat exposure without fading or corrosion
- Significant engine bay aesthetic upgrade – clean billet brackets with properly mounted square coils deliver a refined, purposeful appearance compared to factory pencil coil locations
- Wide cross-platform compatibility makes this a versatile upgrade for LS swap projects, drag racing builds, off-road applications, and street performance vehicles
Installation Notes:
-
LSA / LS9 incompatibility: This bracket set will NOT fit LSA or LS9 supercharged V8 valve covers due to different mounting geometry. Verify your engine variant before ordering
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Coil sourcing required: This bracket set does not include ignition coils – source D581 / 12558693 truck coils separately before installation. These are widely available from GM dealers, online marketplaces, and aftermarket suppliers
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D510C coil users: If you intend to use D510C coils instead of D581, you will need an additional spacer kit (sold separately) to achieve proper clearance
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Wiring harness adaptation required: D581 truck coils use a different connector than factory LS pencil coils – plan for harness adaptation, custom wiring, or coil-on-plug conversion harness sourcing before installation
- Remove the original LS pencil coils and coil mounting brackets before installing the new D581 brackets
- Mount the brackets securely to the valve covers using the included hardware – verify proper alignment and clearance before installing the coils
- Install D581 coils into the mounted brackets and route the wiring cleanly away from heat sources
- Verify hood clearance with coils installed before completing wiring – the 1-1/8" downward offset typically provides adequate clearance, but tall valve cover combinations may require verification
- Test ignition operation at idle and through the RPM range before driving
- Professional installation strongly recommended unless you have experience with LS engine ignition system service
- If unsure about compatibility with your specific LS engine variant, contact our team with your year, make, model, engine displacement, and valve cover configuration before ordering
Warranty:
- 12-month standard warranty from date of purchase
- Contact our support team for assistance with any issues
