There are other threads and posts in this forum from people with lots of experience that say Porsche used the latest available IMSB that was in production when the replacement engine was made, regardless of what the original engine had, and the only way to tell what IMSB is in a Porsche replacement engine is to remove the transmission and flywheel and inspect the IMSB flange. So the seller could be correct, but there is no way of knowing without some documentation or disassembly.
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Current: 2022 718 Cayman GT4, PDK bone stock (the dark side).
Former: 2003 S, 3.6 LN Nickies, ARP rod bolts, under-drive pulley, Fabspeed sport headers, Softronic tune, 987 airbox 987 motor mount, Function-First Sport motor mount insert, Ben's short shifter, Nine8Six projector headlights & center caps, ROW M030, stainless flexible brake lines, B-K rollbar extension & fire extinguisher mount, hardtop
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