Working from memory sometimes isn't always "completely" accurate. My mistake. So....Here's a quote from Andrew's original article he wrote in 2002... Jim
The stock rocker arm pedestals were machined flat to accept the roller-rocker adapter blocks. The roller-rocker assemblies consist of Comp Cams adjustable stainless steel shaft-mount roller-rocker arms that have been modified for the 6.5 diesel. These assemblies utilize a roller bearing on the fulcrum of each rocker, along with roller tips. Each rocker shaft is .625" in diameter and case hardened to 62C Rockwell. The pushrod adjusters are made by Jesel, and retain the stock 6.5 pushrods.
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