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Indmar Ford 6.2 400/440-set of 16 required for engine
The same spark plugs that were installed when the engine left the assembly line.
Spark plugs are matched to the engine for optimum engine performance.
Spark plug design features a fine-wire double platinum pad on both electrodes.
A high melting point provides excellent resistance to erosion.
DO NOT USE THESE PLUGS IN SUPERCHARGED 575 MODELS. USE 597128 IN SC 575 MODELS.