So I decided to try a set of these icon pistons in my latest build. They are very reasonably priced and look pretty good for a claimer series piston. My question is what do they mean by forged head relief. I see on their website they sell two versions of the same piston, one is called a forged piston and one is called a forged head relief. I just found this confusing and can't seem to find any info about it.