This is my little Whipple Motor on the dyno at
Precision Marine .Mark dyno's the motors just like they would be run in the boat All the accessory's and the CMI headers. I even had fluid in the power steering reservoir looping it thru the pump. This is real world dyno numbers. A lot of shops will dyno them with out all the marine stuff on Inflating there horsepower numbers

.The best thing was I went straight from the dyno to my boat ,ready to bolt in and it ran all summer
I am going back in March and Dyno them again and see if I made some more power this time around . I will save all the dyno sheets this time
Ck out the screen shot on the computer of the HP/TQ curves .