I've got an interference engine that lost a timing belt which in turn bent 7 valves. It's a beater car that I would like to get running for cheap. Recently I have been pondering the idea of heating the bent valves with a torch while turning in a drill press, then use the press to apply force to a stationary ball bearing attached to the drill press base.
My concern is the strength of the valves after the heating, bending, and subsequent cooling. I don't really want to do this if there is more than a reasonable doubt that one of these valve heads will pop off and blow a piston/cylinder away. I am aware of the possible consequences, so please don't tell me not to do this, unless you honestly think there is a high risk of failure.
So, if you think this could possibly be successful, what procedure for heating and cooling should I follow? Is there a strength treatment I can apply afterward?
Also I am aware that this could alter the length of the stem from the valve seat face to the keeper groove, however my rockers are adjustable so I should be okay in that respect.