Hello!
After two molds ... and half the prints unusable, I managed to make 6 pairs of cylinders I needed. They are far from perfect.
The base of the cylinder is not flat and I can not sanded properly for they become. So I had to drill holes in the top of the engine block so I can place them correctly. .
It's long to do ...
This one is the most successful of the entire series.
The mold is made of a single piece of silicon, cut with a scalpel only at the base of the cylinders to limit the track joint.
Of course there are lots of bubbles in the resin.
Rest sanding.
Regards.