I have just returned from Bundaberg where I had a quick look around the Queensland International Air show.
There is this little aircraft company up there that also make aero engines and have recently released an 8 cylinder.
Blueprinting to the extreme is all I call call it...The crankcase is machined from a solid block of Alloy. I ran a thumb nail over the join where the crankcase halves join and couldn't feel the edge.
have a look at this:
http://www.jabiru.net.au/engines/8cylin.html
Now..I wonder if I can interest them in making a nice lil engine for the cobra...the power to weight ratio would be fantastic.
You all take care