NGK Racing Spark Plug - 14 mm Thread - 21.5 mm R - Gasket Seat - Stock Number 3857 - Resistor Remote Oil Filter Adapter An optional red plastic plug

An optional red plastic plug is available for the center hole

1/8 in Thick x 36 in Wide x 4 ft Long

7/16-14 in and 1/2-13 in Male Thread

For over 10 years

GM Fullsize Truck 1963-72

NGK Racing Spark Plug - 14 mm Thread - 21.5 mm R - Gasket Seat - Stock Number 3857 - Resistor Remote Oil Filter Adapter An optional red plastic plugProduct Description: Spark Plug NGK Racing 14 mm Thread 21. 5 mm Reach Gasket Seat Stock Number 3857 Resistor Sold Individually With over 80 years of automotive expertise, we are driven by extreme dedication to performance and quality. From OEM to aftermarket, our people push the boundaries of innovation to bring the latest technologies to market under the NGK and NTK brands. Since 1936, NGK Spark Plugs has been the world leader in technology,