I ran a search for these heads and I came accross some threads in which Jeff participated, he kinda had the same opinion about these heads just like a couple other guys I asked for info. I am not calling any names though.

Like I said, I dont have these heads on any motor, I havent even held em in my hands.

On another note, I do have an engine running 440 source heads, rods and crank. It runs perfect. No issues. I dont think a Callies crank, Oliver rods and Edelbrock heads were a necessity....so far!!!