Page 7170: Spark Plug Component Information | Roadmaster Estate Wagon
Spark Plug: Description and Operation
DESCRIPTION
Platinum-tipped, resistor-type, tapered-seat spark plugs are used on the engine assembly. No gasket is used on these tapered-seat spark plugs.
When replacing spark plugs, use only the type specified in Application and ID.
OPERATION
Normal service is assumed to be a mixture of idling, slow speed, and high speed driving. Occasional or intermittent high-speed driving is needed
for good spark plug performance. It gives increased combustion heat, burning away carbon or oxides that have built up from frequent idling, or
continual stop-and-go driving.
