26-06-2021, 09:05 PM
You could put an additional lug on the end of the valve chest as one would do when building a sprint/race engine. The damaged lug would then not take any real strain and with a self locking nut fitted to the stud it would probably work happily in a touring engine. I guess the lug could be repaired by an extremely competent welder but the risk of introducing brittleness is probably quite high, others may have further comments on this as it is not an area of my expertise.
Black Art Enthusiast