Speedmaster 1-274-038 H-Beam Connecting Rods 6.385" 4340 Chromoly BBC 454 w/ ARP 2000

Speedmaster 1-274-038 H-beam connecting rods deliver exceptional strength and durability for high-performance Chevy big block 454 engines. Engineered from aircraft-quality 4340 chromoly steel, these rods are built to withstand the extreme demands of supercharged and nitrous-injected applications.

Key Specifications:

• Center-to-center length: 6.385 inches
• Big end bore diameter: 2.200 inches
• Pin bore diameter: 0.990 inches
• Material: 4340 chromoly steel
• Fasteners: ARP 2000 series connecting rod bolts

Performance Features:

• H-beam design provides maximum strength-to-weight ratio
• Doweled cap design ensures precise cap-to-rod alignment
• Extra clearance profiling accommodates stroker crankshaft applications
• 100% X-ray and ultrasonic inspection for quality assurance
• Shot peened surfaces with complete stress relief treatment

The included ARP 2000 fasteners are precision CNC-machined and feature rolled threads that provide up to ten times more fatigue strength than OEM bolts. Heat-treated for maximum reliability, these fasteners are engineered to handle the increased cylinder pressures of high-output racing engines. Perfect for street/strip builds, forced induction setups, and other demanding performance applications.