30-03-2018, 12:25 PM
Steve,
These types of head are not that uncommon and you are right the blanked off holes originally held priming cups / taps fitted to very early cars. I'm afraid I do not have access to an illustration. My understanding is that the material between the two copper washers is asbestos.
If you not concerned with originality, and / or the presence of asbestos, then I'm sure a copper crush washer will suffice.
Having used several of these heads over the years I have straightened out the original copper washers best I can and refitted them without any leakage problems.
Trust this helps.
Chris
These types of head are not that uncommon and you are right the blanked off holes originally held priming cups / taps fitted to very early cars. I'm afraid I do not have access to an illustration. My understanding is that the material between the two copper washers is asbestos.
If you not concerned with originality, and / or the presence of asbestos, then I'm sure a copper crush washer will suffice.
Having used several of these heads over the years I have straightened out the original copper washers best I can and refitted them without any leakage problems.
Trust this helps.
Chris