Manley 15038-4 H-Tuff H-Beam Connecting Rod Set Mazda Speed 2.5L 5.9" Length

The Manley 15038-4 H-Tuff Series connecting rod set is engineered for high-performance Mazda Speed SMZR 2.5L engines requiring superior strength and reliability under extreme boost and horsepower conditions. This 4-cylinder set features Manley's advanced H-Tuff design, which bridges the gap between standard H-beam and Pro Series I-beam connecting rods.

Key Specifications:

• Center-to-center length: 5.9 inches
• Manufactured from premium 4340 forged steel
• H-beam design with reinforced cross-sections
• Big end bore: 2.166 inches
• Big end width: 0.859 inches
• Wrist pin diameter: 0.886 inches (22.5mm)
• Weight matched to +/- 1.5 grams per set
• Includes ARP 2000 3/8" rod bolts

Advanced H-Tuff Features:

• Double-ribbed pin surround for increased pin bore strength
• Wider beam with increased cross-sectional thickness in critical stress areas
• Enhanced blade thickness compared to standard H-beam rods
• Perfectly round big and small ends with tightly controlled bend and twist tolerances
• Heat treated, stress relieved, shot peened, and 100% individually magnafluxed

Manley's H-Tuff connecting rods are manufactured to the same exacting quality standards as their OEM products, making them ideal for boosted applications, nitrous, and high-horsepower builds. Each rod undergoes rigorous quality control to ensure dimensional accuracy and structural integrity for demanding motorsports and performance street applications.