Mercury finger ports

[KIRCHNER]

QUESTION'' what exactly are they, what is there purpose, does my2.4 220 chrome bore have them? and are they aperformance mod or not. what models have them, & where are they n what do they look like???

[Dave S]

all.. post 82 have em.......

[Merc 2.5]

Except 2.0. Only champ mota