Tubular K-Member - Mopar B/E-Body

The QA1 Tubular K-Member for Mopar B/E-Body vehicles is a purpose-built front suspension component engineered to improve header clearance and accommodate big block engine installations. This steel k-member features a black powder-coat finish for corrosion resistance and is designed specifically for 1971–1974 Mopar B-Body and E-Body platforms, providing the structural support and clearance necessary for high-displacement engine swaps and modern exhaust configurations that factory chassis components cannot accommodate.

The tubular construction reduces weight while maintaining rigidity compared to factory stamped designs, a critical advantage when building big block–powered vehicles that require precise geometry for suspension geometry and brake line routing. The improved header clearance is the defining specification—factory k-members create packaging constraints that force builders to use restrictive headers or modify primary tubes, both of which compromise exhaust scavenging and engine performance. QA1's design eliminates this compromise, allowing full-flow headers and optimized exhaust manifold angles. At 43.3 lbs and measuring 21.3 × 12.5 × 38 inches, the component integrates into existing frame attachment points without modification to adjacent structures.

This k-member is intended for restomod builders, street rod fabricators, and serious enthusiasts undertaking large-displacement engine installations in classic A-body or E-body Mopars. It addresses a specific engineering challenge: factory suspension components were never designed for the thermal mass and dimensional envelope of big block engines paired with modern exhaust systems. The tubular design also simplifies future modifications—the structural integrity and additional clearance reduce the need for custom fabrication work downstream, protecting your investment in engine work and reducing assembly labor during suspension installation.