The best sites to go to if your starting a foundry
backyardmetalcasting
ABYMC.com
Frank's shop
Lionel's Lab Forum!
Jim's Motorsport
This is one of the best site to go and find what you need,If that doesn't help he has a ton of links to other peoples websites.
Tim and Tom put together this great site,This is where I first posted pictures of my oilburner.
Frank is pretty cool guy,even built his own CNC mill machine from scratch.
This is a really great place to ask questions about metalcasting.
Check out Jim's website the coolest motorsport accessories on the web