I just received a new set of 216 High Lift Rocker Arms manufactured in Anderson, CA. Reasonable costs, great workmanship and the went right on my engine. I did a cold set first, started it up and brought it up to operating temperature and then set each Rocker at the proper clearance. I'm very happy. They made a set for my son who has a GMC 248 and he has had the same success. These folks are knowledegable and very helpful.