screw size for alternator cover

[gggGary]

For Pi I regularly use 3.1415926535897932384626433832795028841971693993751058209749, but often when in a rush I round the last digit up.

I use this.

 

[5twins]

I've started using button head Allens here. I like the look .....

I also use them for the points/advance housing covers .....

 

[Scottrt]

"I've started using button head Allens here. I like the look ....."
I'm using these very screws for my carb tops (and alt. cover), bu never thought of using for the cam end covers...Thanks for the great idea!

 

[arcticXS]

Button head, countersunk and low socket head Allen screws all look better than the regular type Allen screws, but do have one common drawback. That is that the drive hex is smaller and shallower. Which is fine as long as your Allen keys/drivers/sockets are in perfect shape, not rusty or worn. And forget about using the ball end on these fasteners.
Not to mention using imperial allen keys on metric fasteners, and vice versa. Nooooooo!