Swing Arm Idler Bracket For 3.437 Snout Dia.

The Swing Arm Idler Bracket for 3.437 Snout Diameter from The Blower Shop (MPN 4130) is a precision-engineered aluminum component designed for supercharger belt tensioning and pulley adjustment in high-performance engine applications. This polished idler bracket maintains consistent belt pressure across the supercharger drive system, a critical function in forced-induction setups where belt slip directly compromises boost delivery and engine performance.

Machined from aluminum and finished to a polished state, the bracket accommodates the 3.437-inch snout diameter specification required for compatibility with specific supercharger pulley configurations. The compact footprint (8.3 x 3.6 x 8.4 inches) and manageable weight of 2.05 lbs allow for straightforward installation in engine bays where space is at a premium. The swing-arm design provides adjustable tension control, enabling technicians to dial in proper belt load during initial setup and across varying engine operating conditions—a detail that directly affects supercharger reliability and belt longevity.

This bracket serves engine builders, performance shops, and serious enthusiasts running supercharged platforms who need OEM-specification or OEM-equivalent idler hardware. Whether rebuilding a factory forced-induction engine or assembling a custom high-output supercharger system, proper belt tensioning is non-negotiable—inadequate tension reduces boost consistency, while excessive tension accelerates pulley and bearing wear. The Blower Shop's engineering ensures this component meets those demands with precision fitment and reliable performance.

The polished aluminum construction resists corrosion in typical automotive environments while maintaining the clean aesthetic preferred in show and street applications alike. SKU BLS4130 allows for quick ordering and reference when sourcing replacement or additional hardware for multi-vehicle builds or fleet maintenance programs.