Speedmaster 1-274-021 H-Beam Connecting Rods 6.125" 4340 Chromoly SBC 350 ARP 8740

Speedmaster 1-274-021 H-beam connecting rods deliver exceptional strength and reliability for high-performance Chevy small block 350 engines. Manufactured from aircraft-quality 4340 chromoly steel, these connecting rods are engineered to withstand the extreme demands of supercharged and nitrous oxide applications.

Key Specifications:

• Center-to-center length: 6.125 inches
• Big end bore: 2.100 inches
• Pin bore: 0.927 inches
• Material: 4340 chromoly steel
• Fasteners: ARP 8740 connecting rod bolts

Premium Construction Features:

• H-beam design provides superior strength-to-weight ratio
• Doweled cap design ensures precise cap-to-rod alignment
• Extra clearance profiling accommodates stroker crankshaft applications
• X-ray and ultrasonic testing for quality assurance
• Shot peened and stress relieved surfaces for enhanced fatigue resistance

ARP 8740 Fasteners:

• Precision CNC-machined to exact specifications
• Heat-treated for maximum durability
• Rolled threads provide up to 10 times more fatigue strength than OEM bolts
• Engineered specifically for high-combustion racing engines

These connecting rods are ideal for serious engine builders seeking proven performance and durability in demanding racing and high-horsepower street applications. The combination of aerospace-grade materials, rigorous quality control, and premium ARP hardware makes these rods a reliable choice for your Chevy SBC build.