You need to use a Torx Plus 45 bit, as stated in the S&S Engine Manual page 3-47 (freely available on this link. https://www.mtwc.co.uk/wp-content/uploads/2018/01/SandS-X-Wedge-1.pdf) The replacement crank pinion bolt should be a new 12 point head bolt and is part of the cam chest modification kit, more info on this available on the MTWC website as well......but you probably know that Craig 😉. If the TP45 bit doesn't work or the head is damaged I have heard of welding a nut to the end and using that while still hot to remove it.