Flow numbers on MN47 Head.

[1 fast z]

So I am jumpin in and getting some of these customers MN47 heads done, (I have 3 in here for guys right now). I did a some what of a street port, which means only raising the intake port about .160". There is also ALOT of internal work, that is some what tricks that I like to hold on to. But anyways, both of these test were done with the stock 42mm valve, and not the 44 mm intake valve, like All 280's have. I will put the bigger valves in tommorow, and get new test numbers.

 

The ratings were all taken at a .200" starting number, and then they go up in .05" incriments from there. All CFM Ratings are done at 28" of water.

 

Here are Modified numbers:

106.5

125.4

142.0

153.8

168.0

177.5

191.7

198.8

203.5

210.6

215.3

 

Here are Stock numbers:

99.4

123.1

132.5

146.7

156.2

165.7

170.4

175.1

175.1

175.1

175.1