Granatelli GM LS & LT 0-Ohm 12" Blue High-Temp Spark Plug Wires – 28-1629HTBL

Give your ignition system room to route without giving up spark performance. Granatelli 12-inch blue 0-Ohm spark plug wires combine added routing flexibility with a direct, low-resistance path from coil to plug.

The Granatelli 28-1629HTBL 0-Ohm High-Performance Spark Plug Wire Set is designed for performance applications that benefit from a longer 12-inch boot-to-boot wire length. The additional reach makes it easier to route around headers, brackets, relocated coils and other engine-bay components while maintaining a clean professional installation.

Built with 8mm blue high-temperature silicone insulation rated to withstand temperatures over 500°F and a stainless-steel spiral-wound core, these wires deliver the heat resistance, EMI/RFI suppression and spark-transfer performance needed for demanding GM LS & LT builds.

MORE ROUTING FREEDOM. ZERO-OHM PERFORMANCE.

GUARANTEED 5–10 HP GAIN

Naturally aspirated applications can see a measurable horsepower increase, while supercharged, turbocharged and nitrous combinations may see even greater gains.

Key Features

• True 0-Ohm resistance for maximum available ignition-energy transfer
• 12" overall length – measured boot end to boot end
• 8mm blue high-temperature silicone insulation
• Designed to withstand temperatures over 500°F
• Stainless-steel spiral-wound core helps suppress EMI & RFI interference
• Designed for compatible GM LS & LT coil-near-plug ignition applications
• 12-inch configuration provides additional flexibility for custom routing
• Excellent for relocated coils, headers and modified engine bays
• OE-style boots and terminals for straightforward installation
• Compatible with modern ECUs and aftermarket tuning systems
• Excellent for naturally aspirated, supercharged, turbocharged and nitrous applications
• Pre-assembled – no cutting, trimming or crimping required
• Complete V8 set – 8 wires
• Made in the USA

More Length for Better Routing: The 12-inch boot-to-boot configuration provides added reach compared with shorter wire sets, making it easier to route around headers, accessories, brackets and relocated ignition coils without putting unnecessary tension on the wire or terminals.

0-Ohm Technology for Strong Spark Delivery

Granatelli's 0-Ohm conductor design is engineered to minimize resistance between the ignition coil and spark plug so more of the coil's available energy reaches the plug. Consistent spark delivery becomes increasingly important as RPM, cylinder pressure, boost and horsepower increase.

12" Length for Custom LS & LT Builds

The longer 12-inch boot-to-boot length makes the 28-1629HTBL particularly useful for LS swaps, relocated coil configurations and modified engine bays where the factory wire length may no longer provide the routing flexibility you need. The added length lets you position the wires more carefully around heat sources and surrounding components.

High-Temperature Blue Silicone Construction

Headers and performance exhaust systems can expose ignition components to substantial under-hood heat. The 8mm blue silicone jackets are rated for temperatures over 500°F and are designed to resist heat, abrasion and demanding operating conditions while adding a clean blue performance look to the engine bay.

Compatible GM LS & LT Applications

Designed for compatible GM coil-near-plug ignition applications using the correct 12-inch boot-end-to-boot-end wire configuration. Granatelli specifically identifies several popular LS-family engines for this wire set.

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 heat protection, but proper clearance from headers and other extremely hot exhaust components is still recommended whenever possible.