ARP 247-6303 Connecting Rod Bolt Kit

The ARP 247-6303 Connecting Rod Bolt Kit is a complete kit of rod bolts (also called con rod bolts or connecting rod fasteners) for engine builders who want a dependable fastener at the weakest point of the connecting rod. The ARP name is stamped on each bolt.

Key Features:

• Forged in-house at ARP
• Heat-treated on special vertical racks for complete 360-degree penetration
• Threads rolled after heat treatment for up to 10 times longer fatigue strength
• Precision CNC-machined to exacting specifications
• Designed for optimum reliability in each application

Wave-Loc Features (available for most applications):

• The Wave-Loc surface contacts the rod and cap for optimum alignment and reduced fluctuating stress, which strengthens the rod itself
• Snug fit for OEM connecting rods (interference range of .001 to .005) despite a wide range of factory rod bolt hole tolerances
• Patented Wave-Loc surface design gives better material grain flow than knurled bolts, which have sharp edges and built-in stress risers
• Galling and scoring of the rod is virtually eliminated, since there is only smooth contact and no digging

Care and Service: Monitor the stretch of each rod bolt and replace it once it has permanently elongated by .0005.

The best choice depends on the loads the bolts carry, meaning piston and rod weight and engine speed. The most cost-effective bolt has strength just above its anticipated load plus a safety margin for occasional overloads. A stronger material adds an extra margin of safety and service life, at higher cost.