On an e tec 250 there is about 8 knots more out of an updated end of 2007 or 2008 power head than a pre up rated version
Enough for me to really notice the difference and to go up a prop to cope with it
I am expecting the same power difference between the new block 300 and the 250
starting prop testing on a 23 on the lower end, will let you know, I raced a 350 verado, and waved it good-bye! On tests
