Advance Headers | Mild Steel Exhaust Extractors | Holden HQ-WB 253 308 V8 | A412
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Advance Headers | Mild Steel Exhaust Extractors | Holden HQ-WB 253 ...
Description
Description
Advance Headers High-Performance Mild Steel Exhaust Extractors for Holden HQ to WB 253 & 308 V8 Engines
The Advance Headers Performance Exhaust Extractors (A412) are classic heavy-duty tubular manifolds engineered explicitly for golden-era Australian GM Holden muscle cars and commercial utilities. Tailored to fit the legendary small-block Holden 253-Cubic Inch (4.2L) and 308-Cubic Inch (5.0L) red, blue, and black V8 powerplants, this kit spans a massive heritage vehicle lineage, including HQ, HJ, HX, HZ, and WB model series. By replacing the highly restrictive factory cast iron log manifolds, this mandrel-bent configuration significantly drops engine backpressure, optimizing gas scavenging velocity to unlock vital low-to-mid range torque and that unmistakable classic Aussie V8 rumble.
PRODUCT CONTENTS:
- 1 x Heavy-Duty Mild Steel Left-Hand Holden V8 Extractor Header Assembly
- 1 x Heavy-Duty Mild Steel Right-Hand Holden V8 Extractor Header Assembly
Key Features:
- Tuned mandrel-bent primary piping pathways ensure completely uniform internal flow geometry, optimizing exhaust scavenging velocity across daily driving and high-load towing bands
- Substantially optimizes low-to-mid range torque delivery—ideal for improving throttle response, open-road cruising, and hauling loads in commercial utility setups
- Heavy-duty mild steel construction structurally built to handle intense under-bonnet thermal expansion cycles and typical classic V8 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 gas leaks
- Engineered for a fast workshop turnaround, featuring an estimated baseline installation window of just 2 hours
Specifications:
- Brand: Advance Headers
- Part Number: A412
- Material: Mild Steel (Standard Finish)
- Engine Suitability: Holden 253ci (4.2L) & 308ci (5.0L) SOHC OHV V8 Petrol Engines Only
- Component Type: Performance Exhaust Extractors / Headers
- Estimated Fitting Time: 2 Hours
- Welding Required: No (Direct Bolt-On Configuration to Cylinder Heads)
⚠️ Crucial Transmission & Selector Linkage Fitment Alignment Warnings:
This product (Part No. A412) is formed precisely to navigate the engine bay aprons, chassis rails, and crossmembers of the HQ-WB platform. However, if you are fitting these extractors to a vehicle utilizing a Column-Shift Trimatic automatic transmission configuration, you must purchase and use the dedicated linkage adapter kit (Part Number: A412-Linkage). Failure to adapt the selector node will result in physical interference between the shifting arm linkages and the primary exhaust pipes.
Please Note: Professional installation by an exhaust specialist or qualified classic automotive mechanic is highly recommended to guarantee proper system alignment, selector clearance checkouts, and a perfect leak-free seal.
Important Information
- The image shown may not reflect the actual product design.
- Ensure your vehicle details match the application guide below before purchasing.
Vehicle Applications for A412 Performance Holden V8 Extractors
| Make | Model | Year Range Spec | Body Type | Chassis Series | Engine Details | Fitting Time | Drivetrain / Fitment Notes |
|---|---|---|---|---|---|---|---|
| Holden | Kingswood / Premier / Belmont / Monaro / Statesman | 1971 – 1980 | 4-Door Sedan / 2-Door Coupe / 5-Door Wagon / Ute / Panel Van | HQ / HJ / HX / HZ Series | Holden 253ci (4.2L) & 308ci (5.0L) V8 (Red / Blue Block Families) | 2.0 Hours | RWD | Mandrel-bent upgrade routing mapped to clear classic steering boxes and underbody structures. Fits floor-shift manual/auto formats directly. Requires A412-Linkage kit for Column-Shift Trimatic versions. |
| Holden | WB Series (Caprice / De Ville / Commercial) | 1980 – 1985 | Long-Wheelbase Luxury Sedan / Utility (Ute) / One-Tonner Cab-Chassis / Panel Van | WB Series Only | Holden 253ci (4.2L) & 308ci (5.0L) V8 (Blue / Black Block Families) | 2.0 Hours | RWD | Heavy-duty configuration fits commercial applications and luxury cruisers cleanly. Check column-shift mechanism clearances prior to torque-down phases. |
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