Mercury Mark 20 powerhead crankcase assembly vintage outboard

Description

For sale is a powerhead for Mercury Mark 20 outboards, this powerhead is in working condition. Compression was ok when we tested it, the top cylinder had 100 psi and the bottom had 90 psi. The reciprocating assembly is nice and tight, and it was only used in freshwater. This powerhead is a nice candidate for rebuild.  The magnet for the magneto is included, and it did work properly. See pics.
If you have any questions, or need to see additional pictures, please ask!
This part was removed from a 1954 Mercury Mark 20, serial number:
813870