Paul................Jim Oddy recommended the Isly-EZ rollers to me 2 yrs ago .904 as you know i drive this car offen on the street and they have been trouble free. Along with the T&D shaft set up my valve lash is never been out over .001. Just freshened then motor over the winter and check every lifter. They all checked out perfect. just ran the quickest ever friday night @ e-town on a small hit (new plate) and all is still well. They work IMO. good luck.