Triumph Stag - What prevents the oil pan from being pulled straight down when you try to remove it.

I have another video on how to remove the pan, but here is a closer look of the pan on a spare engine. I show why the pan can't be pulled straight down. (The rear engine plate gets in the way).

[@rexreid2412]

I am so glad to see video of your '71 engine oil pan and work you're doing on the engine. You give me hope. I still have the intact 1963 Triumph TR4 car I bought in 1979. The car would start but engine knock was severe. Inspection revealed milky oil and water with severe crankshaft, piston/cylinder wear (and everthing else). I sealed the car for a total project rebuilt in the future. Every year I look to create a planned resurrection of the '63 TR4. This may be the start of the resurrection. Thank you!