PART NO.  SPL.PAGE  DESCRIPTION                                                            
CLS2613   TC.A.12   Stud for inlet manifold (short) (5) -(cyl.head, valves, engine, Twin
    Cam)

CLS2613 Stud, short is item #28 below (5), used to secure the inlet manifold to the cylinder head (Twin Cam engine).
High strength stud (55-ton).
Length = 1-5/8"
Top end thread = 5/16-24-UNF x 5/8"
Bottom end thread = 5/16-18-UNC x 15/32"
Notice that original CHSxxxx studs have short dog point on top end, which males it very easy to start the nut.
CLSxxxx studs may not have the dog point.
A leading "0" means plain stud. -- A leading "2" means zinc plated.