HP Copper Spark Plug - Shorty - 0416S-4 air-cleaner-assemblies 3 V8 1969 - 1972

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BUT this changes the air flow to the intake and can cause poor cylinder distribution and drivability issues

HP Copper Spark Plug - Shorty - 0416S-4 air-cleaner-assemblies 3 V8 1969 - 1972Overview: ACCEL's patented race proven spark plugs in a Shorty configuration. The overall length has been reduced 3 16 in to 3 8 in (depending on the specific spark plug) to gain critical air gap between the spark plug boot and the exhaust manifold or header tube. This helps eliminate burning the spark plug boot or dimpling the header tube. The shorter spark plug length also can make it easier to install an remove the spark plugs in certain