I mocked up my lower manifold of my Kenne Bell 2.8 to my TEA/TFS 245cc heads and found an interesting matchup. I figured the ports would be significantly smaller on the kb manifold but didn't expect the shape and alignment to be so off. The port floors match up pretty well but the walls and roofs aren't even close. I am planning to open up the manifold ports on the right wall (as looking at the pics below) but am unsure what to do with the roof due to the injector bosses. As for the left wall, it will just have to be the way it is cause I am not touching the port on the heads. Take a look at the pics and let me know what you think about porting the manifold for best flow into the heads.











More pics can be seen HERE

 

I did the same to my TVS but I only had to clean up the manifold as it was really close already.

 

What did you do on the roof of the port by the injector bosses?

 

I would get it as close as what you feasibly can and then not lose much sleep over any other mild miss-alignment, as typically the air-flow is somewhat stagnant along the port walls and is instead more centered towards the middle of the ports.

 

Do you plan to run these heads forever or sell them at some point. Obviously if you plan to keep the heads, then I would match the bottom left corner to the manifold. If you are in there doing it already, you might as well make it perfect. But then your screwed if you don't sell the heads and blower together

 

This always intrigued me too... I've been told, much like pat says, there isn't much room for improvement though.

 

I don't want to do any porting on the heads. I want to see what I can get out of this 2.8L blower setup but there is a chance I could change setups in the future which I will use the same heads with a different manifold.