My Father and Son are working on a TO-30. They have it back together now, and I was wandering if they need to run it and then re-torque the head bolts. If so, should the engine be cold or warm when re-torquing?
Yes, running the engine and getting it up to operating temperature and then torquing again is the ideal. To do it right you will need a special offset socket tool for your torque wrench. Snap-On had a very nice one but it is currently out of production. There is another version that will work and sold by Snap-On, MAC and most of the other tool suppliers. Hopefully you coated the gasket liberally with Copper Coat before installing it and followed the torquing sequence described in the shop manual.