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REF: Oiling & Lubrication - Sub-05A
Running External Rocker Box Drains
There were no oil returns on the old Axtel big bore (or the day) cylinders.
So the oil return for the rocker boxes was piped externally.
If a windage tray was used, you could return the oil behind that (staying away from the wheels). 1)
1)
Racepres of the XLFORUM http://xlforum.net/forums/showthread.php?t=2002736