Port map.

[ima75man]

lawrence, my Name is Fredrick Sherman, you can find me on facebook, i can't give you that map, but they didn't say how much i had to charge so for a dollar and a stamped envelope with your return add you can have it.

freddie, i'll send you a check and and a stamped envelope.. never know when i'll need another mod 50....the map would come in handy................. thanks again...............

[Fast Fred]

anyway, best to modavate not alienate do you see how the power valve relates?

[Mark75H]

No, I'm still lost on the power valve relation

[Fast Fred]

power valve, forces the exhaust to blow down and out a lower port hight, this make more low end power.
not lookin for more low end on the outboard, but keepin some or most of what is there and still gettin the high port, you want to chanfur the top of the port so she blows down and out
this will help keep the power band from bein peaky. you follow?

[88workcar]

Finger ports are added, you must drill a hole in the piston to match it.
Oh, don't worry about the money......

[ima75man]

Finger ports are added, you must drill a hole in the piston to match it.
Oh, don't worry about the money......

i think this map works on hydros with quickee lower unit.the mod 50 powerhead wasn't design to run v-bottoms...i've wasted alot of money trying,easy way to more power,just bolt on a stock 56 in. omc. powerhead.. this works...