This is the distincive magnesium cambox cover fitted to racing SOHC camobox's, which allow for the central oil feed to the camshaft. These were fitted to the racing (magnesium) cambox's used on competition Inter's and Manx's from the early 1930's through to the introduction of the DOHC. This type of cover were also often fitted to the later (Featherbed) Inter models.
As always with the castings I have made - I have had patterns made using an original Norton casting to copy from, and as you can see from the photograph, they are virtually indistinguishable from an original.
These castings are cast in high quality magnesium alloy and come fully chromated (and as you can see from the photographs, sprayed in Duck Oil to protect them from corrosion in storage), and if you are intending to fit our cambox oil feed jet boss, I can also fit this for you before sending out - as per the top photograph.
This listing is for the bare casting, but all other parts required for the central oil quill feed are also available in this section