I will have barrels fitted to the 500 by next weekend (awaiting piston clamps) and know from reading previous posts over the years that engine can go in without head, then fit head whilst engine in the frame. I'm not too bothered about the weight issue so what the pro's and cons of fitting head when engine in frame? - i.e. frame in the way making certain bolts, etc awkwards to fit.
Took the engine out complete and only used to fitting 750 engine - were you can only fit complete