I was at the foundry today, taking a gander at the first prototype high-riser casting. Now that the standard intake adapters are running fairly smoothly in production, I can start thinking about doing the programs for this bad boy:


This casting has not yet been heat treated and is still covered with some casting sand; it will be a couple of weeks before I get my hands on it. It is also a full 20 pounds heavier than the raw medium riser casting!
This one is going to be trickier to machine than the medium riser casting, just because of it's size. Right now, when the 4th axis on my CNC machine spins the castings around and moves them into position for the various machining operations, the casting itself comes very close to hitting some of the tools in the toolholder. The high riser casting would definitely hit some of them if run through the same operations, so I may have to split the machining into a few different operations, with limited tools in the toolholders. I have to admit I'm kind of looking forward to that challenge. Meantime, I have a couple of weeks to just continue running the medium riser adapters, and try to get some work done on my SOHC project...