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The valves I turned the profile of the valves with a small and old CNC lathe that I purchased from a school, I replaced the entire electrical/electronic part with a Chinese CNC controller and a computer I lapped the valves with a tool that rotates back and forth a few degrees, with drill I...

Intake and exhaust ports I changed the inclination of the ports (15°) because as seen in the drawing they intersect the fixing holes of the heads test to verify the alignment of the hole

Valve cages installed, press fit and high temperature Loctite , hole and thread for spark plug , inlet and outlet holes

Some polished parts of roker arms

In these photos you can see how they were made

After the construction of the valve cages I milled, drilled and turned the other components for the valve system : roker arms , roker housing,roker housing cover , valvebox ,valve box cover , etc. Some of these parts are made of brass, others are made of aluminium, I decided to build everything...

Bronze valve cages

Another milling step on the heads, valve cages seats The project only includes the valve seat rings, but I prefer the complete cages where the valve stem slides on the bronze

I tried 2 types of casting plaster but I had fractures and small cracks, perhaps because I didn't respect the burnout cycles perfectly , then I tried ceramic and I have no problems. I continue with ceramic , I can easily find it on Amazon and burnout is easier and faster Iules

Sorry for my late reply, in reality I don't use plaster but ceramic powder, it resists high temperatures better and has greater mechanical resistance. However, it is more difficult to remove from the aluminum casting This is the product I use https://amzn.eu/d/5wG8X4S this is also suitable...

I generally pour the molten aluminum into the plaster model right after I remove it from the oven , 550 C or 1020 F, the aluminum remains liquid for at least 10-15 minutes and more penetrates into the small cavities. I also hit small bumps on the plaster creating vibrations that facilitate...

For my aluminum castings I use both ingots and scrap machined pieces to be melted again but all of the same type of aluminum (Al Si 9 Cu 3) (USA ASTM B179-82 333.1 - 332.0 ) This aluminum alloy can be hardened and aged artificially, but I have never tried, sooner or later I will. Hardening is...

Lost PLA, Harley Davidson heads I tried to make the heads with the lost PLA technique to avoid hours and hours of milling, some positioning on the milling machine. I thought it would be difficult to obtain cooling fins with a thickness of 1.3 mm but I wanted to try. The technique for making...

My new tool, 3D edge finder, to find the center of the workpiece on the milling machine it is completely automatic, with a small program, it resets the origins of the piece, X axis and Y axis or Z axis

The complete cylinders, with Viton O'Rings

The cylinders Terry who has already built this engine suggested lengthening the cylinders, to be more similar to the original. In this drawing the black part at the top is the elongated part compared to the Draw Tech project ,of course I also had to lengthen the connecting rods by the same...

Milling of the connecting rods some discarded pieces, I redid the outer connecting rod 3 times due to carelessness

The assembled crankshaft, with an external alignment cylinder during the finishing turning of the shafts . first step, right side second step , left side Final check of the coaxiality of the 2 shafts, without bearings and with bearings Max error detected 0.03 mm

For the connecting rods I provided bronze bushings, mechanically the needle bearing are better, they have less friction, but the bushings are simpler and more robust.