NGK 6378 Spark Plug

NGK Laser Platinum Spark Plug 6378

NGK Laser Platinum Spark Plug 6378 is an OE-style ignition component built for precise fitment and stable spark delivery in high-performance applications. It uses a platinum center electrode, nickel ground electrode, and a 5,000 ohm resistor to support consistent ignition performance in select Ferrari and Maserati engines.

The Laser Platinum line focuses on OE replacement specifications, including a flat seat, 10.00 mm thread diameter, 0.75 reach, and a pre-gap of 0.028 inch for listed applications. Part number 6378 is also identified as PMR8B.

Key Features

• Laser Platinum spark plug with platinum center electrode tip
• 5,000 ohm resistor for ignition noise suppression
• Copper core center electrode and nickel ground electrode construction
• Standard ground configuration with one ground electrode
• 0.028 inch pre-gap for listed OEM applications
• Flat seat, 10.00 mm thread diameter, 0.75 reach, and 5/8 hex
• NGK part number 6378, also referenced as PMR8B

Product Details

NGK is a long-standing OE supplier in North America with broad coverage across automotive applications. The Laser Platinum Spark Plug line is built around original-equipment specifications, making this plug a direct replacement choice for select Ferrari 360, Ferrari F430, Ferrari 599 GTB, Ferrari 599 GTO, Ferrari Enzo, Maserati Quattroporte, Maserati Coupe, Maserati GranSport, and Maserati Spyder applications. For buyers searching for NGK 6378 spark plug fitment for Ferrari F430 or Maserati Quattroporte, this part matches the listed OE-style dimensions and gap requirements.

This part cross-references AMS Automotive 6378 and interchange 192637 for the same application.

What It Helps Address

• Misfire caused by worn or fouled spark plugs
• Hard starting from weak ignition output
• Rough idle related to inconsistent spark delivery
• Reduced throttle response from degraded plug performance
• Service replacement needs on listed Ferrari and Maserati models

Installation Notes

Verify the engine application against the vehicle service information before installation. Confirm the specified gap for the exact model, since the Ferrari Enzo notes a 0.032 inch OEM-recommended gap while other listed applications use 0.028 inch. Use the correct torque procedure for the cylinder head material and inspect ignition coils, boots, and plug wells during service. Part number 6378 is a direct-fit style spark plug for the listed applications, including Ferrari 360 and Maserati Coupe fitment.

Quality Assurance

NGK manufactures spark plugs to OE standards and supports a wide range of domestic and import vehicle applications. The Laser Platinum design reflects NGK’s OE-focused engineering and manufacturing experience for dependable ignition service in the vehicles listed above.