Don great work on those engines. I particularly like the paddlewheel engine. On cast iron suppliers, I have found it difficult to find reasonably priced suppliers for plain stock... but concur that Speedy is a good source and easy to deal with. Speedy is pretty good on price. They quoted me about $7.50 per inch for 4" round. Downside for me is no Website pick-up at their Detroit location... I had hoped to stock up on some goods when I go to N.A.M.E.S show. Terra Nova Steel and Iron in Canada (Ontario and Alberta) also supplies Cast and Ductile Iron.