How many of us are there? Owners of Dodge based RV's?

Has anyone started to make 'aftermarket' heads for the 440?
Back in the 90s, a friend of mine had cracked heads on his. When he enquired as to new heads the parts people said the last 10k pairs had been sold to a high performance company to be sold to the racers.

The attraction was that they had water jackets in the heads, supposedly. The price for new or used heads was more than the MH was worth at the time.

We pulled the engine and tranny, and installed a 390ci ford motor and tranny.