midget,For reference:
For the 4 REC valves I have been using for flow testing, dimensions for the stem Ø
REC 740 Exhaust valves: Stem Ø .2346" (nominal 6mm)
REC 739 Intake valves: Stem Ø .2346" (nominal 6mm)
6mm = .23622"
The valves are marked with Work Order numbers as follows:
REC 740 Exhaust valves: W/O 25956
REC 739 Intake valves: W/O 25813
Valve from the same batch lot
SHOULD be dimensionaly consistent.
Inquire from G&S for the W/O number on their inventory for anything you might order.
So these valves are appropriately sized to be oil pressure relief valves for a "Rat" . . . . . . . .
F/B