Mercruiser 120hp 140hp 165hp 3.0L 2.5L 4.1 Front Engine Adjustment Bolt Nut Stud Steering Helm Parts Piston (Standard / Stock Size

Piston (Standard / Stock Size Bore): Part Number 389115 / 0389115 (Stamped Casting P/N is 323604)

This would be an item I would recommend to just try and install it first try and properly adjust the settings

This is for the Design-II coil

If you are unsure if this will work for you OR YOU NEED TO CONFIRM DIMENSIONS

May work on many other years

Mercruiser 120hp 140hp 165hp 3.0L 2.5L 4.1 Front Engine Adjustment Bolt Nut Stud Steering Helm Parts Piston (Standard / Stock SizeItem Details Used with pretty much all MerCruiser Inline engines (2. 5L 120hp 4cyl, 3. 0L 140hp 4. 1L 165hp inline 6 cylinder) from the mid 80's) (these parts specifically, but the main stud was actually used all the way until the 2000's and you should be able to swap most of these components to the ones from the early 70's. Freshwater Used Part Quick rundown of the parts here: 16 36100T (16 36100T) Main Adjusting Stud 12 36103 Adjusting Stud Washer