Here I have turned the tubes for the engine exhaust/inlet ports.
The tubes were glued to scrap plastic to hold them
in place while I sanded them to fit the cylinder heads.
The outlet tubes are being test fitted here.
Overall pic showing the engine components so far.
The tubes have been glued to the cylinder head, the scrap
plastic will be cut and sanded off when the glue has set.
As seen from another angle.