Are these Denver/Cheater Heads? ID help.

[Jason in TX]

Thanks for all the info about the Denver heads. I knew about the Weiand cheeters and when I saw these, I immediately looked for the Weiand info and stampings behind the water neck, but nothing is cast or stamped in this area.

I have not been able to track down a similar image or info about these heads. Anyone else have a clue?

Thanks everyone.