Eagle Specialty Products FSI Series Forged 4340 I-Beam Connecting Rods

The Eagle Specialty Products FSI Series Forged I-Beam Connecting Rods represent a performance-proven rotating assembly upgrade engineered for street performance, naturally aspirated competition, and modified pump-gas racing applications. Positioned between Eagle's entry-level SIR I-Beam rods and their top-of-the-line H-Beam lineup, the FSI Series delivers premium materials and critical hardware at an accessible price point — making it the ideal choice for builders who refuse to compromise on quality.

Each FSI rod is forged from ASME-certified SAE 4340 chromoly steel, with forgings random spot-checked for alloy consistency to ensure every rod meets the high strength-to-weight demands of performance engine building. The classic I-beam profile is a time-tested, race-proven geometry that requires fewer machining steps than an H-beam design, providing a cost-effective upgrade over OEM connecting rods without sacrificing structural integrity. Eagle has further optimized the FSI forging with added material at the parting line, bolt head clamping area, and rod shoulder to maximize big-end rigidity and help prevent bore distortion under high cyclic loads.

Key Features:

• Forged SAE 4340 Chromoly Steel — ASME-certified alloy with random spot-checks for alloy consistency, delivering exceptional strength and durability in demanding performance applications
• Optimized I-Beam Forging — Race-proven geometry with added material at critical stress points for improved big-end rigidity and bore stability under sustained cyclic loads
• Shot-Peened Surface Treatment — Enhances fatigue resistance and extends service life under the rigors of high-performance and competition use
• ARP 8740 Cap Screw Bolts Included — Every set ships standard with ARP 8740 cap screw-style rod bolts; ARP 2000 bolt upgrades available on most applications
• Silicon-Bronze Wrist Pin Bushings — Fully bushed small end supports full-floating piston pin assemblies for reliable, long-term operation
• Precision Alignment Sleeves — Included on every set for accurate cap location and consistent assembly
• Weight-Matched Sets — Sized using the Sunnen Kross grinding system and matched to ±1 gram for proper rotating assembly balance straight out of the box
• Broad Engine Platform Coverage — Available across a wide range of popular domestic engine platforms to support diverse stroker and performance build requirements

About Eagle Specialty Products:

Eagle Specialty Products is one of the largest and most trusted aftermarket connecting rod and crankshaft manufacturers in the performance industry. Through large-scale manufacturing and an unwavering commitment to ASME-certified 4340 steel, ARP fasteners, and silicon-bronze bushings, Eagle delivers rotating assembly components that professional engine builders and performance enthusiasts rely on for consistent, race-proven results.