You will lost a lot of Horse power. You could advance the timing or rejet
the carb. Since I run a V-8, I just take the boat. Where it will run 34 at
sea leavel, I get about 25 on Tahoe.

"Bryan" wrote in message
...
I have a Mercruiser Alpha One carbureted 6 cyl 190 hp motor on my boat.
Should I expect the boat to run normally at Lake Tahoe or will it need a
tune up each time I visit Lake Tahoe from sea level?
I've been told I don't need to alter the tuning if I switch props to one
with more torque when I visit Tahoe.