Hello, Rene,
yes, they're open chamber heads.
First of all thank you for the information to everybody. Yes, I read the articles. That is the reason for my request here in the forum. There is so much information that I am overwhelmed with it. I would like to build the engine myself, I have professional support. I also have time, because my Pantera runs perfectly with the crate engine. I am only unsure which components I should buy and which combination harmonizes well.
Thanks
Andreas