Mercruiser OMC 6cyl Inline 165hp 4.1L GM Distributor Assembly Alpha One Stringer Complete Upper & Lower Gearcases The threads on these are

The threads on these are "fine-thread" FYI

so make sure to check the physical part for the number if you are unsure

but 1971-1980 for some of the other parts part of this complete assembly on 50hp

Item Description Mercury Part Number 708-447A1 / 717-1182A4 Piston & Pin (set of 2 as pictured)

Crankshaft Compatibility by year: (this is based on my research and the OMC parts diagrams)

Mercruiser OMC 6cyl Inline 165hp 4.1L GM Distributor Assembly Alpha One Stringer Complete Upper & Lower Gearcases The threads on these areItem Details Removed from a 1974 Mercruiser 165hp 4. 1L (also compatible with OMC from that time period, these both are the same blocks and used the same distributor) Part Number Delco Remy 1112621 6A21 (52277, 58205, 62419, 72623, 62419, 72623, 62426, 81192) These were the same and interchangeable over all of the different years this 6 cylinder engine was produced. This is an earlier model of this distributor because of the mounting for the