OP - hope you don’t mind me jumping in but didn’t want to start a new thread considering it’s same exact issue with my 64 LeMans - bought from a friend who had someone who else build the engine. It has the one-piece BOP RMS and the one piece BOP oil pan gasket. From my inspections the flywheel engine side is always dry so I assume the leak is at the pan to cap intersection. It sucks cause the engine is leak-free otherwise. No leaks from rear of valve covers or dizzy area. A few pics below with the undercarriage shot showing the amount of oil after a cruise.
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Will Rivera
'69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears
‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears
'64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears (Traded)
'69 LeMans Vert, 350, #47 heads: Non-running project
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