[rotorwrench]

Billet two piece heads have been done before. Mostly by folks that don't want to cast any parts. It's another place to leak. Chamber shapes & spark plug placement are important too so I wonder that they look like. The 8BA was specifically designed for better cooling by placing the exits at the front and incorporating thermostats. The larger deck coolant ports at the back are part of that. To change any of that doesn't make much sense. To add any of it to the earlier prewar or post war 59 series heads doesn't make sense either. One type does not necessarily fit all well.