Had a long chat with an experienced engineer friend of mine today, and amongst other things we discussed repair of cast iron. He said that if strengh is not critical, but a reliable long last repair is, that its always better to braze rather than weld.
The main reason for is apparently there is far less chance of the repair cracking as it cools or failing in service. Found an excellent web page that explains all of this in an easy to understand way, and this looks to me an ideal way of making good broken or damaged cast parts belonging to a Lister engine.
http://www.mig-welding.co.uk/cast-iron.htmBill