Before you bolt'em on make sure they are certified MIL Spec S-6758 F4.

Manufactured from special Mil Spec 4130 F4 Chromoly to provide a uniform holding force. CBP Chromoly Head Studs are hardened, tempered, cold drawn and feature rolled threads. Centerless grinding assures maximum strength and fatigue resistance. CBP Chromoly Head Studs represent state-of-the-art metallurgical and manufacturing technology and are rated at 145,000 psi tensile strength. CBP Chromoly Head Studs are Ultra 90 Black Coated and packaged in complete sets with hardened washers and hex nuts. In addition, CBP kits include an extra 'long' stud for use with late model engine cases with deep cut threads on #3.

NOTE: Studs are 1/2" longer than stock and have an 8mm x 1.25 pitch.

Also available to fit 10mm applications.