Tooling cost for permanent mold is prohibitive. Gas inclusion is also a
concern. Airset or Nobake molding lends itself to this sort of casting.
Then again, the answer might be right in Veeduber's back yard:
http://www.foundry-castings.com/adv4.htm



"cavedweller" wrote in message
...

Well if that's the case, how about semi permanent molding...gravity
pour and reusable tools? There's lots of that around for automotive
manifolds and heads....