I agree with Frenchtown...The Mercruser cam I had in my 250 will out top end (mph) anything i have had in my car. Pulled like a bear from 2850 to 4700 and out of snuff at 5000. You can over cam these motors real easy even with a good build. The head just will not flow those big cams and ragged around town. I want to try something in the 268 duration range and about 525 lift. If this don't work out my Merccruser is going back in.!!! I have lost 11 mph and the 350/350 crowd is loosing respect for me.
