Does any one know the thread side for an A65 OPRV?
I want to test the oil pressure on my 1968 A65 but since this is the earlier version, it doesnt have the extra hole for the oil pressure switch.
The engine was built a a couple of years ago with all new components including TS journal, reground crank, big ends, pistons etc and I'm using a SRM
type OPRV which I believe is working fine.
However as I am using the original 1968 alloy oil pump (which I meticulously rebuilt) I want to check the oil pressure.
My plan is to find a suitably sized bolt, drill and tap a hole in the center for an oil pressure gauge. With the engine warm I should be able to remove the the SRM
OPRV and temporally add my test gauge for a minute or to, checking the pressure at idle and at 3k rpm or so.
All I need to know is the OPRV thread size to proceed with my experiment.
Thoughts and comments welcome.