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Restore That LT1 Snap to Your 1993 Ride
A quarter century of heat cycling leaves factory ignition wires with far more resistance than they had from the factory, and that steals spark energy right when your LT1 needs it most. The Granatelli GMS28-1423S-R High Performance Spark Plug Wire set uses a solid stainless core with near 0 ohm resistance to put more voltage where it belongs, on the plug. It bolts in using the factory routing on your 1993 Corvette or Firebird, no cutting or splicing required.
Key Features
- Solid stainless steel connector cable delivers near 0 ohm resistance for maximum spark energy
- Patented EMI/RFI protector ring keeps electrical noise at or below OEM levels
- 8mm fiberglass reinforced silicone jacket resists heat up to 500 degrees F
- Stainless snap lock spark plug connectors for a secure, corrosion resistant fit
- Direct replacement design uses factory routing and mounting points
- OBD-II computer safe and exceeds OEM ignition specifications
- Bold red wire jacket for a cleaner, upgraded engine bay
- Made in the USA
Fitment Table
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 1993 | Chevrolet | Corvette | Base |
| 1993 | Chevrolet | Corvette | 40th Anniversary Edition |
| 1993 | Chevrolet | Corvette | ZR-1 |
| 1993 | Pontiac | Firebird | Formula |
| 1993 | Pontiac | Firebird | Trans Am |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | GMS28-1423S-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 GMS28-1423S-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 carries forward a name built on decades of American motorsports and ignition engineering. Every GMS28-1423S-R wire set uses the same patented low resistance core and protector ring technology found across the brand's ignition lineup, designed to maximize spark energy delivery while keeping electrical interference under control on classic and modern GM platforms alike.
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FAQ
What is the GMS28-1423S-R?The GMS28-1423S-R is a Granatelli Motor Sports high performance spark plug wire set built for the 1993 Chevrolet Corvette and 1993 Pontiac Firebird with the 5.7L LT1 V8. It uses a near 0 ohm solid stainless core and ships with a red silicone jacket.
Does the GMS28-1423S-R fit the 1993 Corvette ZR-1 with the LT5 engine?No. This set is engineered for the LT1 equipped 1993 Corvette trims listed above. The ZR-1's LT5 engine uses a different ignition layout, so verify your engine code before ordering.
Will this wire set work on a 1993 Camaro Z28?The 1993 Camaro Z28 shares the LT1 engine platform, but this listing is scoped to Corvette and Firebird applications. Check with our team to confirm cross compatibility for your specific Camaro before purchasing.
How difficult is the installation?Most owners complete the GMS28-1423S-R installation in about an hour with basic hand tools by swapping one wire at a time and matching the original routing.
What warranty comes with this part?Granatelli backs the GMS28-1423S-R with a 90 day warranty against defects in materials and workmanship from the date of purchase.
Is this an OEM replacement or an aftermarket upgrade?It is an aftermarket performance upgrade designed to exceed OEM ignition wire specifications, built with a solid stainless core rather than the resistor style core used in the factory wires.
Will these wires trigger a check engine light or cause radio static?No. The GMS28-1423S-R includes a patented EMI/RFI protector ring that keeps interference at or below OEM levels, and it is OBD-II computer safe.
Can I install these wires if my Firebird has aftermarket headers?Yes. The 8mm silicone jacket on the GMS28-1423S-R is rated to withstand up to 500 degrees F, which holds up well in engine bays with tighter header clearance.
Install Instructions
- Park on a level surface, let the engine cool completely, and disconnect the negative battery terminal.
- Work on one cylinder at a time, tracing the factory wire from the coil or distributor cap to its spark plug to confirm routing.
- Twist the boot gently to release the factory wire from the spark plug end, then repeat at the coil or distributor end.
- Route the matching GMS28-1423S-R wire the same way and seat the spark plug boot firmly.
- Press the coil or distributor end connector until the stainless snap lock clicks securely into place.
- Repeat cylinder by cylinder until all 8 wires are installed, keeping wires clear of exhaust and sharp edges.
- Double check every 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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