Merc 40 3 cylinder.
 

I know some of you guys have them. Anybody have one hopped up? If so what speeds are you getting, what boat and what prop are you running?

I had one ported with shaved fly wheel and intake, 60 carbs, and modified tuner. Plugged the top 3 water intakes on the lower unit to run the motor really high. It ran 60mph on a 15/48 weldbuilt. A 20 pitch chopper prop ran the best on it.
Attachment 45735

Thanks for the reply buddy.