This is a Cylinder Head Gasket extension for the Ford FlatHead V8 (https://www.thingiverse.com/thing:2537602).
The gasket is glued to the cylinder head.
The video of the finished project : https://www.youtube.com/watch?v=vm-Y2X2z7cA
https://www.printables.com/fr/model/690204-ford-flathead-v8-engine-complete-package-of-paid-a
The author marked this model as their own original creation. Imported from Thingiverse.