ARP 118-6401 Rod Bolt Kit for 1988-05 Mazda Miata 1.6L B6 / 1.8L BP DOHC

Vehicle Fitment

• 1988-2005 Mazda Miata (1.6 L B6 / 1.8 L BP DOHC)

Features

• 8740 chromoly steel rod bolts
• Heat-treated for ~200,000 psi tensile strength
• Thread-rolled after heat treatment for superior fatigue resistance
• Wave-Loc surface for precise rod-to-cap alignment
• Black oxide finish for corrosion resistance
• Designed to handle high-RPM and performance applications
• Compatible with OEM rod bolt hole tolerances (.001"-.005" interference)
• Part of ARP High Performance / Pro Series standards

Specifications

• Material: 8740 chromoly steel, heat-treated to ~200,000 psi
• Finish: Black oxide
• Design: Wave-Loc surface for improved fit
• Thread-rolled for enhanced fatigue life

Included Components

• 8x rod bolts (8740 chromoly)
• 8x nuts (12-point, if included in kit per ARP standard)
• Relevant washers or assembly lube, if supplied (verify upon ordering)

Product Description

The ARP 118-6401 Rod Bolt Kit is a premium replacement for OEM connecting rod bolts in Mazda Miata models from 1988 to 2005, covering both 1.6 L (B6) and 1.8 L (BP) DOHC engines. Crafted from 8740 chromoly steel and heat-treated to a tensile strength around 200,000 psi, these bolts offer vastly improved performance and consistency, ideal for high-RPM, track, or performance engine builds.

Wave-Loc technology ensures a snug fit between the rod and cap, compensating for factory tolerance variations (.001"-.005"), while thread-rolled construction enhances fatigue durability. The black oxide finish protects against corrosion during assembly and long-term use. This kit is designed to match OEM specs and deliver reliability under elevated stress levels.

Fitment confirmed for 1988-2005 Miata (1.6 L B6 / 1.8 L BP DOHC). Please verify your engine is one of these DOHC variants before installation. Not compatible with non-DOHC or other engine types.