• Use this tool, you will not have to remove the plug and measure it.
• Used to accurately locate top dead center of the piston’s stroke.
• Use this tool with a cam degree wheel to dial in the cam for maximum horsepower.
• 10mm (uses NGK plugs beginning with C).
• 12mm (uses NGK plugs beginning with D).
• 14mm (uses NGK plugs beginning with B).

• Use this tool, you will not have to remove the plug and measure it.
• Used to accurately locate top dead center of the piston’s stroke.
• Use this tool with a cam degree wheel to dial in the cam for maximum horsepower.
• 10mm (uses NGK plugs beginning with C).
• 12mm (uses NGK plugs beginning with D).
• 14mm (uses NGK plugs beginning with B).