Ford 250 2V 6 cylinder engine 6mm inlet manifold heat soak spacer.
These are designed to fit between the cylinder head and intake manifold to slow down the affect of heat transfer from the cylinder head to the inlet manifold.
CNC machined from a reusable phenolic material.
A paper gasket should be used on either side of the intake spacer and fitted dry without any sealant.
If fitted like this the spacer is reusable.