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Wake Up Your LT1 With a Cleaner Spark
Tired ignition wires rob your F-body or C4 Corvette of the crisp throttle response it had on day one. The Granatelli GMS28-1270S-R High Performance Spark Plug Wire set replaces worn factory wires with a near zero ohm solid stainless core, so more of the coil's energy actually reaches the plug instead of bleeding off as heat and resistance. It is a bolt in upgrade for your 5.7L LT1, no cutting, no splicing, no custom fitting required.
Key Features
- Solid stainless steel connector cable delivers near 0 ohm resistance for maximum spark energy transfer
- Patented EMI/RFI protector ring keeps radio and sensor interference at or below OEM levels
- 8mm fiberglass reinforced silicone jacket resists heat up to 500 degrees F for header and turbo proximity
- OEM style stainless snap lock spark plug connectors for a secure, corrosion resistant fit
- Direct replacement design bolts in with factory routing and mounting points
- OBD-II computer safe, exceeds OEM ignition specifications
- Vivid red wire jacket for a cleaner engine bay look
- Made in the USA
Fitment Table
| Year Range | Make | Model |
|---|---|---|
| 1994-1997 | Chevrolet | Camaro |
| 1994-1997 | Pontiac | Firebird |
| 1994-1996 | Chevrolet | Corvette |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | GMS28-1270S-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 GMS28-1270S-R spark plug wires
- Pre installed stainless snap lock spark plug connectors
- Coil and distributor end terminals sized for factory LT1 connections
- Installation instructions
About Granatelli Motor Sports
Granatelli Motor Sports has spent decades engineering ignition and airflow components for street and performance vehicles, building on a motorsports heritage tied to the Granatelli family name. Every GMS28-1270S-R wire set is assembled with a patented low resistance core and protector ring technology designed to maximize spark energy while keeping electrical noise under control, backed by a company that still tests its ignition products on real engines before they ship.
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FAQ
What is the GMS28-1270S-R?The GMS28-1270S-R is a Granatelli Motor Sports high performance spark plug wire set built for 1994-1997 Chevrolet Camaro, Pontiac Firebird, and 1994-1996 Chevrolet Corvette models with the 5.7L LT1 V8. It uses a solid stainless core for near 0 ohm resistance and ships with a red silicone jacket.
Will the GMS28-1270S-R fit my 1996 Impala SS?No. This set is engineered specifically for the F-body Camaro and Firebird plus C4 Corvette LT1 applications listed above. The Impala SS shares the LT1 engine but uses a different wire routing and length, so check with our team before ordering if your vehicle is not listed.
How hard is it to install these wires myself?Most owners complete the swap in under an hour with basic hand tools. Because GMS28-1270S-R is a direct replacement, you can install one wire at a time by matching the old wire's routing before removing it, which prevents cylinder mix ups.
Do I need to gap or replace my spark plugs when I install this set?Not necessarily. The GMS28-1270S-R set only replaces the ignition wires, so your existing plugs can stay in place if they are within their service life. Many customers do choose to install fresh plugs at the same time since the wires are already off.
What warranty comes with this set?Granatelli backs the GMS28-1270S-R with a 90 day warranty against defects in materials and workmanship from the date of purchase.
Is this an OEM part or an aftermarket upgrade?It is an aftermarket performance upgrade designed to exceed OEM ignition wire specifications, not a factory replacement part. It uses a different core construction than the stock wires to lower resistance and improve spark energy delivery.
Will these wires interfere with my radio or check engine light?No. The GMS28-1270S-R uses a patented EMI/RFI protector ring that keeps electrical interference at or below OEM levels, and the set is OBD-II computer safe so it will not trigger false codes.
Can I run this wire set with aftermarket headers or a turbo kit?Yes. The 8mm silicone jacket on the GMS28-1270S-R is rated to 500 degrees F, which makes it a good match for engine bays running closer header clearance or added turbo heat.
Install Instructions
- Park the vehicle on a level surface, let the engine cool completely, and disconnect the negative battery terminal.
- Starting with one cylinder at a time, trace the factory wire from the coil or distributor cap to the spark plug to confirm correct routing.
- Remove the factory wire by twisting the boot gently at the spark plug end, then repeat at the coil or cap end.
- Install the matching GMS28-1270S-R wire in the same routing path, seating the plug end boot firmly onto the spark plug.
- Connect the coil or distributor end firmly until the stainless snap lock connector clicks into place.
- Repeat one cylinder at a time until all 8 wires are replaced, keeping wires away from sharp edges and exhaust components.
- Double check each connection is fully seated, then reconnect the negative battery terminal.
- Start the engine and confirm smooth idle with no misfire codes before test driving.
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