VW 4 cylinder 1600cc

This engine needs to be taken apart oiled & rebuilt, because it has been in storage many years.

some info ;
Great pictures — thank you, these really help.
From the casting numbers and markings I can see in your photos:
The VW logo and the Audi rings are present, which means this is a later replacement case (after Volkswagen acquired Auto Union/Audi in the late 1960s).
The case is stamped with “AS41” — this refers to the magnesium alloy used (“41” = 4% aluminum, 1% silicon), common in Type 1 engines.
The casting number 043.101.101 indicates it’s a 1600cc dual-port engine case, originally used in late VW Beetles, Super Beetles, Buses, and Things (roughly 1971 onward).
So, to answer directly:
👉 This is a VW Type 1 engine case, specifically a 1600cc dual-port, used across Beetle, Bus, Karmann Ghia, and Thing models from the early 1970s through the late 1970s.