Patented Accel U-Groove Spark Plug 

SPECS: 14mm Flat/Gasket, 3/4" Projected, 13/16" Socket, Non-Resistor, Heat Range 7 (Very Hot), 0.035" gap.

Accel's U-Groove Spark Plug Design Puts More Power In The Cylinder So You Have More Power At The Wheels.

One of the hottest features of Accel Spark Plugs is the unique U-Groove ground electrode. The specially designed electrode was developed to meet the demand for improved ignitability and increased fuel combustion. Simply stated ... Higher Performance.

Improved Ignitability

As illustrated in the drawings at right, the U-Groove of the ground electrode results in less flame dissipation. It gives the flame a groove to grow in, creating a larger flame front for a more complete combustion, even in the event of a lean air-fuel mixture. Effectively, it produces greater firing energy. On the other hand, conventional spark plugs squash the flame. This is called "quenching effect" and leads to spark plug misfire and rough idle. This has a negative effect on the spark. With the U-Groove ground electrode, firing can be greatly improved without increasing the plug gap.

Improved Throttle Response and Better Fuel Efficiency

Accel's U-Groove ground electrode produces a larger spark nucleus (kernel) which stimulates faster combustion, producing more power for higher RPM's of longer duration. The end result is an increase in performance with improved throttle response, and due to a more complete burn, greater fuel efficiency and reduced emissions.

Use the heat range chart below for comparisons