It's an 8mm "triple square" head.  You can get the bits at Napa or Pep Boys.
DO NOT use an allen key or torx, you'll strip the heads!

On Mon, Jul 09, 2007 at 02:20:11PM -0700, Bill MacLachlan wrote:
>  can someone please confirm the bit for the star headed bolts on cv joints?
>  is it a torx 40?
>
>
>  thanks all
>
>  Bill M
>  '82GL I4