Can someone explain the differences between the Holley/Weiand 142 and 144 systems??

I have looked directly at the Holley/Weiand sites but got no real answer to what the distinction is between the two.

I have wanted to get a Procharger for the longest time, but a friend suggested I go with a Roots type blower instead of the Centrifugal, so I started exploring these options. For the price it looks pretty good compared to the Prochargers.

Suggestions or tips from anyone?


PDG

 

The difference is that the 144 has teflon strips on the rotor tips which seal better allowing for the extra 2 cubic inches of flow.
The 174 would be a better choice--ya know--no replacement for displacement---that applies to blowers too. the differecne between the two is worth WAY more than the $300 price difference. I have been looking at putting a 250 on for a while now or a whipple screwcharger