ACCEL’S Patened Race Proven U-Groove Spark Plugs in a “SHORTY” Configuration. The overall length has been reduced 1/4” th 3/8” (depending on the specific spark plug) to gain critical air gap space between the spark plug boot and the exhaust manifold or header tube.This helps eliminate burning the spark plug boot or dimpling the ehader tube.The shorter spark plug length also can make it easier to install and remove the spark plugs in certain applications where there is not a lot of room to fit a socket or move a wrench around.

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