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Oil jets

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Bryanj:
Fairy certain bearing are pressure lobes and followers splash

K2-K6:
They are fed like a pressure bearing but have a significant leak out to onward feed the splash section generally.

The oil restriction "jets" are there to separate the high pressure crank assembly from the low pressure head demands and maintain correct pressure level for crank assembly.

The cam is obviously running half crank speed,  the bearings are quite small diameter so surface speed between cam and head bearings is fairly small,  making it fairly undemanding of oil pressure,  as long as it gets a clean constant supply, then it's happy.

More of a constant feed than pressure for cam journals.

royhall:
No need to drill them out, many and frequent oil changes are the key to long engine life on these. A guy at Stafford tried to tell me to drill the oil drains larger? I just walked away.

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