ARP quality delivers increased pre-load clamping force and assures positive timing gear register.
Increased material strength overcomes valve train harmonics and stress.
Pro Series bolt with 190,000 psi tensile strength.
Note – Does not fit standard ST170 engines. Will fit ST170 engines with aftermarket cams and standard type vernier pulleys. These also help increase the clamping load when using aluminum vernier pulleys.
Zetec Lightweight Aluminium Alternator Pulley (Z067) 
