[charlie66]

Originally Posted by taff2

The 'two back halves Torker' looks like it would work well, always fancied trying one when I was naturally aspirated.
Here's a couple of pics of the siamesed ports. In the first pic you can see how little of the back of the valve that the flow stream would see if using a normal intake manifold, the flow stream has to 'bend' around the port wall to get to the valve. Every time that the flow stream has to bend around an obstacle it loses energy and creates friction/fuel drop out.
Now look at the second pic, you can clearly see that if the flow stream is allowed to move over (as in a siamesed manifold/port arrangement like mine) ,that there is now a straight shot to the back of the valve.
My ports are nowhere near optimised, the slope/large radius at the floor corner of the ports that direct the flow stream to the back of the valve are not needed anymore, so the radius of these corners could be 'squared off' quite a bit to further increase flow. A good head porter could considerably increase flow through these I believe. Port volume is massively increased with the siamesed arrangment and mine could be increased even further if I cut the dividing wall even further back towards the bolt boss. I only cut the wall back by around 1" as I was advised that cutting back much further MAY cause charge robbing. I also wanted as much strength in the head bolt area for clamping the heads down.

Thank You! That's a cool idea . ill have to try that some day....