HP Copper Spark Plug - Shorty - 0414S-4 gauges-clusters-and-clocks 9 V8 1961 - 1971

9 V8 1961 - 1971 Ford Ranch Wagon 390/6

For use w/ ferrous metal targets only (does not detect flying magnets)

Provision for installing Holley P/N 20-113

4 V8 2009 - 2018 Dodge Challenger 345/5

HP Copper Spark Plug - Shorty - 0414S-4 gauges-clusters-and-clocks 9 V8 1961 - 1971Overview: 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