Granatelli GM LS & LT 0-Ohm 12" Red High-Temp Coil-Near-Plug Spark Plug Wires – 28-1629HTR

Horsepower starts with a clean, consistent spark. Granatelli 0-Ohm wires are engineered to give your LS or LT a direct path from coil to plug—without unnecessary resistance stealing ignition energy along the way.

Also fits

• 2020–2026 Chevrolet Silverado 2500 HD & 3500 HD 6.6L V8
• 2020–2026 GMC Sierra 2500 HD & 3500 HD 6.6L V8

The Granatelli 28-1629HTR 0-Ohm High-Performance Spark Plug Wire Set combines maximum available ignition-energy transfer with a versatile 12-inch boot-to-boot length for performance builds that need additional routing flexibility.

Built with 8mm red high-temperature silicone insulation, these wires are designed to withstand demanding under-hood conditions while delivering strong, consistent spark performance for stock, modified, naturally aspirated and boosted GM LS & LT applications.

GIVE YOUR COILS A BETTER PATH TO THE PLUG.

DYNO-TESTED GAINS ON GM V8 POWER

Granatelli ignition is proven on the dyno. In LSX Magazine's Project C700 test, a ProCharged LT1 Corvette gained 19.26 rwhp and 18.73 lb-ft after switching to Granatelli coils and 0-ohm coil-near-plug wires, with nothing else changed. See the LSX Magazine dyno test. Results vary with the engine, tune and combination.

Key Features

• 0-ohm conductor design for maximum available ignition-energy transfer
• 12" overall length – measured boot end to boot end
• 8mm red high-temperature silicone insulation
• Heat rated beyond 500°F
• Stainless-steel spiral-wound core helps suppress EMI & RFI interference
• Designed for compatible GM LS & LT coil-near-plug ignition systems
• OE-style boots and terminals for straightforward installation
• Excellent for naturally aspirated, supercharged, turbocharged and nitrous applications
• Ideal for custom routing and performance engine bays
• Compatible with modern ECUs and digital tuning systems
• Pre-assembled – no cutting, trimming or crimping required
• Complete V8 set – 8 wires
• Made in the USA

Easy Bolt-On Performance: Remove your existing spark plug wires and replace them with the Granatelli 0-Ohm set. The pre-assembled construction and OE-style terminals make installation simple with no custom wire building or ignition conversion required.

12" Length Gives You More Routing Freedom

The 12-inch boot-to-boot configuration gives you additional flexibility when routing around headers, brackets, coil locations and other engine-bay components. It is especially useful on modified or custom setups where a shorter wire may create unnecessary tension or restrict your routing options.

0-Ohm Performance Where It Matters

Your ignition coils generate the energy needed to fire the plugs. Granatelli's 0-Ohm conductor design is engineered to minimize resistance through the wire so the maximum available coil output reaches the spark plug. Strong ignition delivery becomes increasingly important as RPM, cylinder pressure, boost and horsepower increase.

Built for High-Temperature Engine Bays

Performance headers, turbo systems and modified exhaust components create intense heat around the spark plugs. The 8mm red high-temperature silicone construction is rated beyond 500°F and designed to provide dependable protection in demanding street, strip and race environments.

Compatible GM LS & LT Engine Families

Designed for many compatible GM LS and LT engines using the correct coil-near-plug layout and 12-inch boot-end-to-boot-end wire configuration.

Common Engine Sizes

Important Fitment Notice: These wires measure 12 inches from boot end to boot end. Engine family or displacement alone does not guarantee physical fitment. Compare your existing wire length, ignition coil location, spark plug boot configuration and routing before ordering.

Heat Notice: The high-temperature silicone construction provides increased protection in demanding engine bays, but the wires should still be routed with proper clearance from headers and other extremely hot exhaust components whenever possible.