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The replacement engine I purchased comes with a sump in which there is no gap between the front of the oil tray and the sump, so I plan to use that sump instead of the original which had a 1/2" gap.
I notice on both engines that the casting wall between the camshaft gallery and the timing case has a weir which is lower than the first rearward weir. I therefore plan to add a plate and drill a hole at the same level as the rearward weir to allow a limited amount of oil to flow forwards.
On both engines it looks as though the casting between the camshaft gallery and the timing case has been chipped away. since I cannot see how this could have happened in service, I wonder is this is a long forgotten tweak to reduce oil consumption? Does anyone know what the original casing looked like? A photograph would be great!