Motorcraft Platinum Spark Plug for Indmar Ford 6.2L 400/440

Bring back crisp starts and smooth, reliable power with an OEM-correct Motorcraft Platinum spark plug for Indmar Ford 6.2L 400/440 marine engines. This is the same Motorcraft Platinum plug type used for factory ignition performance on the Indmar-calibrated Ford 6.2 platform—ideal for routine tune-ups, seasonal service, and “summer prep” maintenance when you want confidence in fitment and on-water drivability.

Built for durability, this plug uses a fine-wire design with double platinum pads on both electrodes, helping resist wear and erosion over time. The result is consistent spark quality to support clean combustion, stable idle, and dependable acceleration across the RPM range.

• Fitment: Indmar Ford 6.2L 400 and 6.2L 440 engines
• Plug type: Motorcraft Platinum (OEM-style replacement)
• Electrode design: Fine-wire with double platinum pads (both electrodes)
• Use case: Marine engine ignition service, tune-ups, seasonal maintenance
• Quantity required: 16 spark plugs per engine (sold individually unless otherwise stated)

Important fitment note: Do not use on supercharged 575 models. For Indmar SC 575 applications, use part 597128.