Wow the Aardema welded block engine is exactly what I was talking about. Throw a 5-axis CNC machine into the mix and it is thoroughly doable.

If you want pushrods, move the camshaft up like the GIII so they are out of the way of the rotating stuff. The cam and lifters could be in a separate block machined out of a billet so every lifter is precisely located.

He used a channel to base the engine around, that was a new idea for me. But everything else is about how I imagined it.

BTW, this is not a new idea. The first Crosley car had an engine that was furnace-brazed out of pieces. It, however, was not a success and after a little while the block was replaced with cast iron.

R.