Advance Headers | Mild Steel Exhaust Extractors | Holden HD-HG Red Motor Powerglide Auto | A84

PRODUCT CONTENTS:

• 1 x Heavy-Duty Mild Steel Red Motor Performance Extractor Header Assembly

Key Features:

• Specially configured and clearance-mapped around the wide physical dimensions of the vintage GM 2-speed Powerglide automatic transmission casing to prevent linkage binding
• Tuned mandrel-bent primary piping pathways ensure completely uniform internal flow geometry, optimizing exhaust velocity and eliminating heavy factory log manifold restrictions
• Substantially optimizes low-to-mid range torque bands—ideal for street cruising responsiveness, crisp acceleration, and classic restorations
• Heavy-duty mild steel construction structurally built to handle intense under-bonnet thermal expansion cycles and typical classic inline-6 vibrations safely
• Thick, precision laser-cut cylinder head flanges maintain a flat, ultra-stable mating footprint to permanently guard against warping, face distortion, and high-pressure exhaust leaks
• Engineered for a fast workshop turnaround, featuring an estimated baseline installation window of just 1.5 hours

Specifications:

⚠️ Crucial Drivetrain Geometry & Cylinder Head Architecture Alignment Warnings:
1. Strict Engine Style Mapping: This product (Part No. A84) is shaped explicitly for traditional 9-port Holden Red inline-6 blocks. It will NOT fit later Blue or Black engines featuring 12-port cylinder heads due to entirely distinct exhaust port spacings and intake manifold mating configurations.
2. Chassis Steering Column Clearance: Formed to sweep around original steering column pathways smoothly across the HD-HG platform run. Always check secondary bracket offsets if custom conversion linkages have been installed.

Please Note: Professional installation by a classic vehicle exhaust specialist or restoration workshop is highly recommended to ensure proper starter motor access, underbody pipe paths, and a perfect leak-free seal.