The last two weeks have been spent collecting parts for dyno testing in the coming months. So far I have two additional headers to test back to back against the MM pulse chamber header - an Ireland 1 5/8 to 1 3/4 step race header and a Stahl 1 3/4 race header.
Here is the Ireland header (black) vs the Stahl (silver)
And here is the Metric Mechanic header
I dug out a set of my old TWM intake manifolds to test against the MM intake manifold too
I spent the entire weekend machining a prototype venturi for my Weber 50 DCO carb borrowing an idea I have seen used in Formula Atlantic. This design in theory should improve CFM flow thru the carb while at the same time boosting signal strength and fuel atomization. It was worth 6-8hp on a full tilt FA engine using my same carbs so I felt it was worthwhile to try to build some. The prototype came out well but still tweeking a few dimensions before sending it to a CNC shop to machine up several copies. Besides these custom chokes, I will be testing my big 46MM Weber chokes and need to pick up sets of 42 and 44MM Weber chokes to round out the testing on the intake side.