ARP Accessory Drive & Bracket Hardware

ARP’s accessory hardware covers the fasteners around the front and sides of an engine. Complete accessory kits replace the external bolts across an engine in a single order. Single-purpose kits cover the harmonic balancer bolt, the alternator and coil brackets, the starter, the pulleys and the front mandrel on belt-driven accessory drives.

Most kits are offered in more than one form: polished stainless steel or chrome moly, which ARP marks CM, and a 12-point or a hex head. The choice is largely about looks and the tools you use. Balancer bolts are the exception, since they hold the crank pulley, and some have a square drive to take a breaker bar.

The listings give the thread and, for many parts, the under-head length, the figure to check when brackets or spacers differ from standard. No kit is tied to a particular car; the engine is the reference.

Balancer bolts are torqued high, so hold the crank with a proper tool rather than the starter or a gear, and use the thread treatment the kit specifies. On an accessory drive, fit the belt and check its alignment across the pulleys before the final tightening.