Standard cam. 1/2 inch head stud. 4.5 bore hemi. Ordered June of 2018. Arrived first part of October 2019. . It took a while but I knew that going into it. Very happy with what I have checked so far. Waiting for a honing plate from BHJ. I was kept up to date on issues they were sorting out. What impressed me most is they stopped and corrected anything they deemed an issue before release. New KB with refinements.