On my 289 I originally used .0025 clearance for rods and .002 for mains, with
oil restrictors throughout. The current
Oil Pump is a Precision Pumps (reworked Melling) Hi Volume, High Pressure unit; the newer design with the shaft extending into the bottom cover. This was installed when they became available as I thought the extended shaft was a definate design plus, that had been missing in the Ford pumps. Per Melling the bypass is set at 80#. Using Kendall GT-1 10-40
oil the engine develops 80#+ at cold start up. When warmed up it has a solid 70# at road speed above 2000 RPM and 35#-40# at idle. It has been bullit proof for 14 years. Although it is not a high mileage engine, it routinely get reved above 6800 RPM.
