Manley 14011-4 H-Beam Connecting Rods for 1990-2005 Mazda Miata 1.6-1.8 L

Vehicle Fitment

• 1990-1997 Mazda Miata (1.6 L / 1.8 L)
• 1999-2005 Mazda Miata (1.6 L / 1.8 L)

Features

• High-quality H-beam connecting rod set for sport compact performance engines
• Forged from durable 4340 steel for strength and fatigue resistance
• Heat treated, stress relieved, shot peened, and magnaflux inspected for reliability
• Weight matched to within ±1.5 g for smooth engine operation
• Precision-final honed big and small end bores for accurate fitment
• Supplied with high-strength ARP 2000 3/8" cap screws
• Designed for applications up to ~600 hp in stock block configurations
• Balanced performance components to support aggressive tuning and engine builds

Specifications

• Rod type: H-beam
• Material: Forged 4340 steel
• Center-to-center length: 5.233 in
• Big End Bore: 1.890 in
• Big End Width: 0.860 in
• Pin Diameter: 0.787 in (20 mm)
• Pin Bore: 0.7881 in
• Approximate weight per rod: ~533-535 g

Included Components

• 4x H-beam connecting rods (4340 steel)
• 4x ARP 2000 3/8" cap screws

Product Description

The Manley 14011-4 H-Beam Connecting Rod Set is engineered for performance and durability in Mazda Miata B6 and BP engine platforms (1.6 L and 1.8 L). Built from forged 4340 steel with precision machining, shot peening, and stress relief treatments, these rods are designed to withstand the demands of high-RPM operation and power upgrades. Each rod is weight matched to within tight tolerances to ensure balanced rotation and smooth engine behavior throughout the rev range.

Supplied with high-strength ARP 2000 cap screws, this set is ideal for enthusiasts and engine builders upgrading or rebuilding the Mazda Miata's bottom end for enhanced reliability and performance. Whether used in a naturally aspirated street build or a lightly-tuned sport compact project, the 14011-4 rod set delivers the strength and precision necessary for engines approaching the 600 hp range. Installation requires normal engine assembly procedures and appropriate rod bearings (sold separately), and the set is recommended for Miata engines within the confirmed 1990-2005 fitment span.