NGK 3623 BPR6EFS Spark Plugs.
Fit's most Multi-Port Injection and Throttle Body Engines in tournament ski and wakeboard boats.
Malibu-Indmar Monsoon & Hammerhead Engines.
Gap to .045 on most Indmar Engines that require this Spark Plug
Make sure to use Anti Seize on Aluminum Cylinder Heads (All Hammerheads & Corvette Engines)
Use Di-Electric Grease to avoid spark plug boots from Sicking & Tearing
View BPR6EFS Application Chart (Link)