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.
https://cults3d.com/en/design-collections/dancan13f/ford-flathead-v8-engine-add-ons
Cylinder_Head_Gasket.stl | 313.9KB |