Eagle 13303L040 Small Block Chevy 350 Street Performance Rotating Assembly .040 Over 1-Piece Seal

The Eagle Specialty Products 13303L040 is a complete street performance rotating assembly engineered for the Small Block Chevrolet 350 with a 1-piece rear main seal (1986 and later applications). This unbalanced kit delivers an affordable, performance-ready bottom end solution for naturally aspirated engines producing under 500 horsepower, and is designed around a .040" overbore (4.040" bore) with a standard 3.480" stroke crankshaft.

Kit Includes:

• Eagle Cast Steel Crankshaft – 3.480" stroke with improved fillet radii for added strength and rigidity over OEM
• Eagle "SIR" I-Beam Connecting Rods – 5.700" length, forged 5140 steel construction with 3/8" ARP 8740 capscrews
• Hypereutectic Aluminum Pistons – .040" overbore (4.040" bore), matched to the 1-piece seal application
• Piston Rings – Hastings plasma-moly rings suited to the intended application
• Rod and Main Bearings – Clevite or King brand bearings included

Important Notes:

• This assembly does not begin with "B" and is therefore unbalanced — professional balancing by a qualified machine shop is required before installation
• Designed for 1986-and-later Small Block Chevy engines with a 1-piece rear main seal
• Eagle Specialty Products reserves the right to substitute piston brands based on availability
• All Eagle rotating assemblies are test-fitted in-house before shipping

Eagle Specialty Products is an industry-leading manufacturer of high-performance connecting rods, crankshafts, and rotating assemblies. The 13303L040 offers an excellent combination of value and durability for street performance builds targeting the popular SBC 350 platform.