Latest news is the Hughes are Morels--They can be bought through just about any cam grinder like Bullet, etc and seem to be the best available--I have used several sets now with great luck--quiet as a mouse peeing on a ball of cotton and they can and will accept 1 1/2 turns preload NO issues--that keeps em quiet with NO issues. Now...will they fit a new Hemi block? Not! I am told by Todd at Marsh--call him for details but the hyd rollers are great!