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Give Your C4 LT1 a Real Spark Upgrade
Factory ignition wires lose conductivity over time, and on an early C4 Corvette that means a slower, weaker spark than the LT1 was designed to produce. The Granatelli GMS28-1409S-R High Performance Spark Plug Wire set swaps in a solid stainless core with near 0 ohm resistance, so voltage gets to the plug instead of dissipating through worn insulation. It is a straightforward, direct fit upgrade that keeps your factory routing intact.
Key Features
- Solid stainless steel connector cable provides near 0 ohm resistance for stronger spark delivery
- Patented EMI/RFI protector ring keeps electrical noise at or below OEM levels
- 8mm fiberglass reinforced silicone jacket rated to 500 degrees F for header clearance
- Stainless snap lock spark plug connectors resist corrosion and vibration loosening
- Direct replacement design, no cutting or splicing needed
- OBD-II computer safe and exceeds OEM ignition specifications
- Bold red wire jacket for a finished, upgraded engine bay look
- Made in the USA
Fitment Table
| Year Range | Make | Model |
|---|---|---|
| 1992 | Chevrolet | Corvette |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | GMS28-1409S-R |
| UPC | Not published by manufacturer for this specific SKU |
| Wire Diameter | 8mm |
| Wire Color | Red |
| Engine Application | 5.7L V8 (LT1) |
| Resistance | Near 0 ohm |
| Boot Material | High temperature silicone |
| Temperature Rating | Up to 500 degrees F |
| Quantity | Set of 8 |
| Condition | New |
What's Included
- Complete set of 8 Granatelli GMS28-1409S-R spark plug wires
- Pre installed stainless snap lock spark plug connectors
- Coil and distributor end terminals sized for the factory LT1 connection
- Installation instructions
About Granatelli Motor Sports
Granatelli Motor Sports builds on a family name synonymous with American motorsports, applying decades of ignition and airflow engineering to street and performance parts. The GMS28-1409S-R wire set carries the same patented low resistance core and protector ring design used across the Granatelli ignition lineup, developed to raise spark energy without introducing electrical noise into sensitive engine electronics.
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FAQ
What is the GMS28-1409S-R?The GMS28-1409S-R is a Granatelli Motor Sports high performance spark plug wire set built specifically for the 1992 Chevrolet Corvette with the 5.7L LT1 V8. It uses a near 0 ohm solid stainless core and ships with a red silicone jacket.
Will the GMS28-1409S-R fit my 1994 Corvette too?Granatelli produces closely related wire sets across the LT1 Corvette generation, but part numbers vary by model year due to coil and routing changes. Confirm your exact year against the listed application before ordering, or contact us if you are unsure.
How long does it take to install this wire set?Most owners finish the swap in about an hour using basic hand tools. Because GMS28-1409S-R is a direct replacement, working one cylinder at a time and matching the old wire's path before removing it prevents mix ups.
Do I need special tools to install these wires?No special tools are required. A plug wire puller can help remove stubborn factory boots without damaging new connectors, but it is not mandatory for installing the GMS28-1409S-R set.
What warranty applies to this part?Granatelli backs the GMS28-1409S-R with a 90 day warranty against defects in materials and workmanship from the date of purchase.
Is this a factory replacement or an aftermarket performance part?It is an aftermarket performance upgrade engineered to exceed OEM ignition wire specifications rather than a stock replacement. The solid stainless core and protector ring are unique to the Granatelli design.
Will this set cause any check engine light or radio interference issues?No. The GMS28-1409S-R uses a patented EMI/RFI protector ring to keep interference at or below stock levels, and the set is OBD-II computer safe.
Can these wires handle a car that sees occasional track use?Yes. The 500 degree F rated silicone boots and low resistance core on the GMS28-1409S-R are built to hold up under the added heat and vibration of spirited street or track day driving.
Install Instructions
- Park on a level surface, allow the engine to cool fully, and disconnect the negative battery terminal.
- Working on one cylinder at a time, trace the factory wire from the coil or distributor cap to its spark plug to note correct routing.
- Twist the boot gently to remove the factory wire from the spark plug end, then repeat at the coil or distributor end.
- Route the matching GMS28-1409S-R wire the same way and seat the spark plug boot firmly.
- Press the coil or distributor end connector in until the stainless snap lock clicks into place.
- Move to the next cylinder and repeat until all 8 wires are installed, keeping wires clear of exhaust and sharp edges.
- Verify every connection is fully seated, then reconnect the negative battery terminal.
- Start the engine and confirm a smooth idle with no misfire codes before driving.
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