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ok so,

the early sb seal that goes in from the inside does not swap out on the BB cover correct??

the later one that goes in from the outside does swap out to the BB correct?

if so I learned something new..thanks

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They late cover uses an oddball sized seal from memory...well, only late small block that is. I've never put a seal in a late small block, only big blocks and early small blocks...but have had the late SB covers around at least to know what they are like

Late cover on the right, and magnum on the left..