Sale Price:
$25.00
Original Price:
$35.00
GMS Precision Spark Plug Gap Tool Kit
Because it’s never too late to step up your GAP GAME.
When you’re building and maintaining a high horsepower / boosted motor, spark plug gap matters more than most people realize.
Too wide, and you risk spark blowout under boost. Too tight, and you can sacrifice combustion efficiency, drivability, idle quality, and throttle response.
The problem?
Many enthusiasts still gap plugs using cheap coin-style tools, or by tapping the electrode against a bench. That approach works… until it doesn’t.
The GMS Precision Spark Plug Gap Tool Kit was designed to give Camaro, Corvette, CTS-V, and high-performance GM owners a cleaner, safer, and more repeatable way to gap spark plugs correctly.
Built for modern iridium and silver racing plugs, this tool allows for controlled, precise adjustments without abusing the fragile center electrode or distorting the ground strap.
Whether you’re installing fresh plugs in a stock LT1 or dialing in a 1,000+ horsepower boosted LT4, proper spark plug gap is one of the simplest ways to improve ignition consistency and reduce misfires under load.
Why Spark Plug Gap Matters
Modern direct injected engines operate under significantly higher cylinder pressure than older platforms.
Add: Supercharger / Turbo boost, E85, Aggressive timing, Higher compression, Increased RPM …and ignition demand rises dramatically.
As cylinder pressure increases, the spark becomes harder to maintain. If the spark plug gap is too large, the spark can literally be “blown out” under load, causing:
Properly setting spark plug gap helps maintain a stable spark kernel under high cylinder pressure conditions.
Why Cheap Gap Tools (or no tools) Cause Problems
Most inexpensive spark plug gap tools bend the ground strap unevenly or apply force in the wrong location.
That can: Distort the electrode, Damage fine-wire iridium tips, Crack porcelain, create inconsistent gap measurements, Alter spark exposure to the combustion chamber.
The GMS Precision Gap Tool was selected specifically because it allows for controlled, repeatable adjustment using a threaded compression-style design.
Key Features:
Compact & Portable
Protects Fragile Electrodes.
Precision Aluminum Construction.
Includes 32-Blade Feeler Gauge tool.
Controlled Adjustment Mechanism allows for Repeatable Results.
Lightweight, durable, and designed for repeated shop or track use.
More accurate and consistent than pry-style or coin-style gap tools.
Allows precise gap measurement across a wide range of applications.
Allows smooth, even movement of the ground strap for safer and more accurate gap changes.
Compatible with most standard style spark plugs including:
What’s in the box?
GMS Precision Spark Plug Gap Tool
32-Blade Feeler Gauge Set
QR code for a “how to video”
Final Thoughts
A spark plug may cost only a few dollars… but when ignition problems start showing up at 15+ psi of boost and 800+ wheel horsepower, plug gap suddenly becomes very important.
The GMS Precision Spark Plug Gap Tool Kit gives you a cleaner, safer, and more professional way to set plug gap accurately for your specific combination.
Because consistency matters.
GMS Precision Spark Plug Gap Tool Kit
Because it’s never too late to step up your GAP GAME.
When you’re building and maintaining a high horsepower / boosted motor, spark plug gap matters more than most people realize.
Too wide, and you risk spark blowout under boost. Too tight, and you can sacrifice combustion efficiency, drivability, idle quality, and throttle response.
The problem?
Many enthusiasts still gap plugs using cheap coin-style tools, or by tapping the electrode against a bench. That approach works… until it doesn’t.
The GMS Precision Spark Plug Gap Tool Kit was designed to give Camaro, Corvette, CTS-V, and high-performance GM owners a cleaner, safer, and more repeatable way to gap spark plugs correctly.
Built for modern iridium and silver racing plugs, this tool allows for controlled, precise adjustments without abusing the fragile center electrode or distorting the ground strap.
Whether you’re installing fresh plugs in a stock LT1 or dialing in a 1,000+ horsepower boosted LT4, proper spark plug gap is one of the simplest ways to improve ignition consistency and reduce misfires under load.
Why Spark Plug Gap Matters
Modern direct injected engines operate under significantly higher cylinder pressure than older platforms.
Add: Supercharger / Turbo boost, E85, Aggressive timing, Higher compression, Increased RPM …and ignition demand rises dramatically.
As cylinder pressure increases, the spark becomes harder to maintain. If the spark plug gap is too large, the spark can literally be “blown out” under load, causing:
Properly setting spark plug gap helps maintain a stable spark kernel under high cylinder pressure conditions.
Why Cheap Gap Tools (or no tools) Cause Problems
Most inexpensive spark plug gap tools bend the ground strap unevenly or apply force in the wrong location.
That can: Distort the electrode, Damage fine-wire iridium tips, Crack porcelain, create inconsistent gap measurements, Alter spark exposure to the combustion chamber.
The GMS Precision Gap Tool was selected specifically because it allows for controlled, repeatable adjustment using a threaded compression-style design.
Key Features:
Compact & Portable
Protects Fragile Electrodes.
Precision Aluminum Construction.
Includes 32-Blade Feeler Gauge tool.
Controlled Adjustment Mechanism allows for Repeatable Results.
Lightweight, durable, and designed for repeated shop or track use.
More accurate and consistent than pry-style or coin-style gap tools.
Allows precise gap measurement across a wide range of applications.
Allows smooth, even movement of the ground strap for safer and more accurate gap changes.
Compatible with most standard style spark plugs including:
What’s in the box?
GMS Precision Spark Plug Gap Tool
32-Blade Feeler Gauge Set
QR code for a “how to video”
Final Thoughts
A spark plug may cost only a few dollars… but when ignition problems start showing up at 15+ psi of boost and 800+ wheel horsepower, plug gap suddenly becomes very important.
The GMS Precision Spark Plug Gap Tool Kit gives you a cleaner, safer, and more professional way to set plug gap accurately for your specific combination.
Because consistency matters.
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