ACDelco MR43LTS Spark Plug, used on Indmar GM 5.7L non-catalyst equipped exhaust engines.

Product Specs:

• GM part #5614210
• Indmar part #491008
• Non-automotive spark plug
• Fit’s most multi-port injection and throttle body engines in tournament ski and wakeboard boats.
• Malibu-Indmar LCR, Monsoon, Hammerhead and many other small block models.
• Pre-gaped to .045
• Make sure to use Anti Seize on Aluminum Cylinder Heads (All Hammerheads & Corvette engines)
• Use dielectric grease to avoid spark plug boots from sicking & tearing
• Sold individually

Bakes Resource Library:

• Indmar Spark Plug & Spark Plug Wire Reference Chart (PDF)