Actually you can get a remake of any of the old heads for the GMC. The Arias is the old Howard and I believe the Wayne Manufacturuing fiasco has those patterns. I hope they will be available again
Don Ferguson has the Fisher/Horning patterns and the original Wayne GMC patterns and has made some of those heads. He currently uses one of his on their Bonneville streamliner. He has also cast up injectors for the Wayne.
The Tom Skinner head is made by Joe Fontana and some are available. I saw the castings when I was there. Rocker covers and side plates go along with it. I also believe he cast up the injectors also. Both my roadster and the Goldman roadster ueed this head and Injector.
All of them use stock rockers. The Horning/Fisher rearrainged the port configuration so a different cam was needed. The Wayne and Skinner do not have combustion chambers. The Horning does. Not sure on the Howard/Arias.
We don't see many on the street as it takes extra cash to do them, but everything seems to take a lot nowdays. Good luck I hope you find what you want.
