Why there is a third screw hole in the valve covers?

[76Datsun280z]

I was curious why the valve covers for these cars were made with a third hole? Yes, two out of the three are used for the wire looms, but what is the the third one for torwards the back of the valve cover?

[Curtis240Z]

On late model 240Zs they are for the choke cables although 280Zs don't have chokes.

[TomoHawk]

So what should you do with that third hole?

[NZeder]

These engines were not only installed in the Zed remember - don't forget they were also used in the RHD, Skylines/240K/240C/260C/280C/Laurels/Patrols just to name a few. Not all of these would have rod operated accelerators so maybe the other hole was used for a cable operated accelerator on a RHD car - most all share the same rocker cover. Most of the what some consider rare big NISSAN valve/rocker covers were from these other models usually the 1980+ models. The latest model I have seen with a L6 installed was a Laurel C31 1984.

[NZeder]

double post sorry about that.