Holden EH HR HK HT HG HQ HX HJ HZ Red Motor Pacemaker Headers PH5004
$695.01
Tax included
Pacemaker Headers PH5004 – Holden EH HD HR HK HT HG HQ HJ HX Red Motor Pre-EGR
Pacemaker PH5004 headers (extractors) are designed for classic Holden EH, HD, HR, HK, HT, HG, HQ, HJ and HX models fitted with Holden six-cylinder Red Motors in applicable pre-EGR configurations. Featuring an interference design with 38mm primary pipes, 51mm secondary pipes and a 57mm outlet, PH5004 headers are designed to improve exhaust flow, torque, throttle response and engine performance.
Suitable for street cars, restorations and performance applications, PH5004 headers also suit multi-carburettor setups and applicable column-change manual and automatic transmissions.
Best Mufflers provides expert advice and fast shipping Australia-wide.
Click the image for larger views and more photos.
Pacemaker Headers PH5004 – Holden EH HD HR HK HT HG HQ HJ HX Red Motor Pre-EGR
Pacemaker PH5004 headers (extractors) are designed for classic Holden EH, HD, HR, HK, HT, HG, HQ, HJ and HX models fitted with Holden six-cylinder Red Motors in applicable pre-EGR configurations.
Featuring an interference header design with mandrel-bent pipework, PH5004 headers are designed to improve exhaust gas flow and scavenging compared with the restrictive factory exhaust manifold, helping improve torque, throttle response and overall engine performance.
These headers are well suited to restored street cars, modified Holden six-cylinder engines and multi-carburettor applications.
Key Features
- Pacemaker PH5004 performance headers / extractors
- Designed for applicable Holden six-cylinder Red Motor applications
- Interference design for street performance
- 38mm primary pipes
- 51mm secondary pipes
- 57mm outlet
- Mandrel-bent pipework for smooth exhaust gas flow
- Thick machined flanges for reliable sealing
- Designed to improve exhaust flow, scavenging, torque and throttle response
- Suitable for multi-carburettor setups
Vehicle Fitment
- Holden EH
- Holden HD
- Holden HR
- Holden HK
- Holden HT
- Holden HG
- Holden HQ
- Holden HJ
- Holden HX – applicable pre-EGR configuration
- Engine: Holden Six-Cylinder Red Motor
Header Specifications
- Part Number: PH5004
- Design: Interference
- Primary Pipe Size: 38mm
- Secondary Pipe Size: 51mm
- Outlet Size: 57mm
- Finish: Pacemaker Blue
- Coating Temperature Rating: 800°C
- Application: Street / Restoration / Performance
Construction
- High-quality mild steel tubing
- Mandrel-bent pipework
- Strong welded construction for durability and long service life
- Thick machined flanges for reliable sealing
- Pacemaker Blue heat-resistant finish rated to 800°C
- Australian made
Additional Options
- Ceramic Coating: See product code "PHC70"
- Exhaust Gasket: See product code "DSF002"
Fitment Notes
- Designed for applicable pre-EGR Holden six-cylinder Red Motor applications.
- Will fit multi-carburettor setups.
- Compatible with applicable column-change manual and automatic transmissions.
- Not suitable for left-hand-drive vehicles.
- Vehicle modifications, engine conversions, non-standard engine mounts, steering components and transmission changes may affect clearance.
- Protect painted surfaces and wrap the headers during trial installation to minimise scratching.
- Lubricate exhaust studs, nuts and threaded fittings with penetrating lubricant before removal.
What's Included
- 1 x Pacemaker PH5004 header assembly
- Outlet connection components as supplied by Pacemaker
Note: Exhaust manifold/header gasket DSF002 is available separately unless specifically included or selected when ordering.
Recommended With
- Exhaust manifold gasket DSF002
- Pacemaker ceramic coating PHC70
- Suitable exhaust sealant where required
- Matching exhaust system, intermediate pipe or adaptor as required
Why Good Headers & Exhaust Systems Matter
At 4,000 rpm, a 3.3L (202ci) Holden Red Motor draws in approximately 6,600 litres of intake air per minute and expels around 19,800 litres of exhaust gas per minute at approximately 600°C.
A well-designed header and exhaust system helps this volume of exhaust gas leave the engine efficiently, reducing unnecessary restriction and improving exhaust scavenging, torque, throttle response and engine performance.
Warranty & Compliance
Pacemaker headers are backed by Pacemaker's 2-year manufacturer warranty, subject to the manufacturer's warranty conditions.
These applications are predominantly pre-1986 vehicles; however, vehicle modifications and engine conversions should comply with applicable registration requirements.
Frequently Asked Questions
What Holden models do PH5004 headers suit?
Pacemaker PH5004 headers are designed for applicable Holden EH, HD, HR, HK, HT, HG, HQ, HJ and HX models fitted with Holden six-cylinder Red Motors in the appropriate pre-EGR configuration.
Will PH5004 fit a multi-carburettor engine?
Yes. PH5004 headers are suitable for multi-carburettor setups, subject to the particular inlet manifold and vehicle configuration.
Will these headers fit a column-change vehicle?
Yes. PH5004 is suitable for applicable column-change manual and automatic transmission configurations.
Will PH5004 fit a left-hand-drive Holden?
No. These headers are not designed for left-hand-drive vehicles.
What size are the header pipes?
PH5004 uses 38mm primary pipes, 51mm secondary pipes and a 57mm outlet.
Are exhaust manifold gaskets included?
The recommended exhaust manifold gasket is DSF002 and is available separately unless specifically included or selected when ordering.
Can these headers be ceramic coated?
Yes. Ceramic coating is available under product code PHC70.
Can I pick up from the store?
Yes. Pick up is available but must be pre-arranged before collection.
How much is freight?
Freight varies depending on your delivery location and where stock is available. Please contact us for freight charges before ordering. Where possible, we can arrange dispatch from the nearest available product location to help reduce freight costs and delivery times.
Do you ship to the USA?
Yes. Best Mufflers regularly ships exhaust systems and exhaust parts to customers throughout the United States.
Please note that import duties, tariffs, taxes, and customs clearance fees are not included in the product or shipping price. Once your order is processed and the applicable charges are calculated, we will send you a secure payment link to finalise the import duties and tariff charges before dispatch.
Customer Support
For phone orders, advice, or part enquiries – contact us:
📞 Call Now: +61 2 9547 3511 ✉️ Email Us
🇦🇺 Best Mufflers
87A Planthurst Road, Carlton NSW 2218, Australia
Exhaust Systems Since 1983
Workshop hours: Mon–Fri 8:00am–5:00pm (By Appointment Only) | Phone and email enquiries welcome 24 hours
Pacemaker-Headers-PH5004
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Pacemaker Headers PH5004 – Holden EH HD HR HK HT HG HQ HJ HX Red Motor Pre-EGR
Pacemaker PH5004 headers (extractors) are designed for classic Holden EH, HD, HR, HK, HT, HG, HQ, HJ and HX models fitted with Holden six-cylinder Red Motors in applicable pre-EGR configurations. Featuring an interference design with 38mm primary pipes, 51mm secondary pipes and a 57mm outlet, PH5004 headers are designed to improve exhaust flow, torque, throttle response and engine performance.
Suitable for street cars, restorations and performance applications, PH5004 headers also suit multi-carburettor setups and applicable column-change manual and automatic transmissions.
Best Mufflers provides expert advice and fast shipping Australia-wide.
Click the image for larger views and more photos.