Advance Headers | Mild Steel Tri-Y Conversion Extractors | Holden Commodore VB-VS GM LS V8 Swap | A317VL

PRODUCT CONTENTS:

• 1 x Heavy-Duty Mild Steel Left-Hand Tri-Y Conversion Extractor Header Assembly
• 1 x Heavy-Duty Mild Steel Right-Hand Tri-Y Conversion Extractor Header Assembly

Key Features:

• High-efficiency Tri-Y (4-2-1) configuration steps primary gas columns down into secondary pairings to significantly boost low-end scavenging torque and mid-range throttle response
• Heavy-wall mandrel-bent 1¾" primary piping transitions cleanly into uniform 2" secondary runners to sustain peak engine breathing without backpressure traps
• Engineered specifically to solve custom engine swap clearance boundaries, dropping cleanly past early K-frames, altered firewalls, and compact under-bonnet profiles
• Heavy-duty mild steel construction structurally built to handle extreme LS V8 thermal cycles, prolonged performance heat loads, and street/strip 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

Specifications:

⚠️ Mandatory Engine Swap Hardware Fitment Restrictions:
This specialized conversion product (Part No. A317VL) is NOT a direct drop-in replacement for standard vehicles. It features severe spatial alterations designed explicitly for custom engine swaps and will strictly only fit if the following modifications are present:
1. Left-Hand Starter Conversion Mandate: The driver-side primary pipelines are routed through the space originally occupied by the starter motor. You MUST utilize a left-hand (passenger-side) starter motor conversion bellhousing/adaptor kit to physically clear these headers.
2. Manual Steering Rack Requirement: Tube clearance profiles are shaped strictly around the tighter, narrow footprint of a manual steering rack assembly. This product will not clear bulky original factory power steering boxes or hydraulic variable-assist rack frameworks due to side-rail path constraints.

Please Note: Due to the tight tolerances and extensive architectural adjustments involved in custom LS engine swaps, professional installation by an exhaust specialist or a qualified conversion performance workshop is highly recommended to guarantee proper system mapping and a perfect gas-tight seal.