Well, two hours late, the nurse finally points the doctor in my direction.
Over the past couple weeks, the machinist has called me numerous times to go over each and every little detail. In those weeks I could hear his passion for the project grow. Tonight when he called with the flow numbers, he was almost as estatic as I was. I doubt I could have picked anyone better for the job. It took for years looking for the right team, and they have all performed way above my expectations. But my hat is off to the machinist, who took this under his wing as if it were his own child. What more could anyone ask for.
Chamber Size: 55cc (however we can leave a bit more facing for 57-58cc)
Valve size - Intake: 1.840
Valve size - Exhaust: 1.500 (more below)
Flow numbers at 28"
Intake
100=52
200=99
300=143
400=180 (better than the OZ250 @ 600)
500=201
600=210 (our goal was 200)
Exhaust (the best part)
100=40
200=79
300=111 (better than the log or OZ head @ 600)
400=144
500=160
600=164 (our goal was 150)
High velocity ports, fast burn chamber with excellent quench and fuel distribution. These guys nailed it.
Now to even up the anti a bit more. The exhaust valve used in the proto type was a 1.50 as that is all that was available. The production head will be using a custom 1.55 with a 20 degree back angle. This will increase the flow and may get it up over the 170 mark. Also remember, the ports have not been polished or touch (yet).
The new head requires a custom stud set, as the pads on the intake side needed to be raised to allow room for the new intake port design. The studs on that side will be about an inch longer than stock. This also required rasing the valve cover walls, so the rim of the cover has room to clear the studs (nuts).
Production heads should be available in two to three months. We still don't have a final price yet, but should be posting it in another week or two. We still need shipping and custom totals, as well as the cost of the custom valves. But we are working on it.