Inter 500 valve lifter

Did the above bike ever come with a valve lifter?

I have just spoken to a friend who restored a -56 Inter last year. Yes, it has a valve lifter. According to him, there is a hole going into the left side of the cambox. The lifter pushes down the exhaust rocker. On the left side of the cambox is a lever connected to the cable. Everything is clearly visible with the tank off. He also said that the axle is excentric and can only be fitted from one side. Hope this helps.

Thanks for the info, I've finally found a b & w pic of my late brother in laws Norton with his old man a stride it. Valve lifter included.

Hopefully I got it right. A bit hard getting it right over phone, without actually seeing it.
He was not sure if the wire nipple should go to the lever or attached to the engine or the head steady, if there was a head steady. I saw the bike running last summer and think he had made a head steady to it.

Here is a Norton 500 of 1955 vintage , can you tell me if it is a Manx engine?Norton 500

Aarrhhhh!
Can't download image!