[Walt Fricke]

All 911 rockers before the 964s are self oilng. They have two oiling holes. When you rebush you drill out the bush where the holes are.

At some point Porsche routed pressurized oil to these. Perhaps in conjunction with the cam box oil line restricter. Which poses the question of whether those of us who rushed to install these restricters on our older cars may have increased rocker shaft/bushing wear a tad.

Walt