Pacemaker Headers PH2500 – Chrysler Valiant Slant Six AP5 AP6 VC VE VF

Pacemaker Headers PH2500 (extractors) are a performance upgrade designed for Chrysler Valiant Slant Six engines fitted to AP5, AP6, VC, VE and VF models. Featuring a tuned-length design with mandrel-bent pipework, these headers help improve exhaust gas flow, scavenging, throttle response and usable mid-range torque while retaining good drivability for classic street cars, restorations and performance builds.

Key Features

• Mandrel-bent 38mm primary pipes, 51mm secondary pipes and 57mm outlets
• Tuned-length design to improve exhaust scavenging and torque delivery
• Improved exhaust flow compared with the restrictive factory exhaust manifold
• Designed to improve throttle response and engine breathing
• Thick machined flanges for dependable sealing and durability
• Pacemaker Blue heat-resistant coating rated to approximately 800°C

Construction

• High-quality mild steel tubing
• Mandrel-bent pipework for consistent internal diameter through the bends
• Precision welded for strength, alignment and reliable fitment
• Strong collector construction designed for long-term street use
• Australian made

Vehicle Fitment

• Make: Chrysler
• Model: Valiant
• Series: AP5 / AP6 / VC / VE / VF
• Engine: Slant Six
• Engine Capacity: Typically 225ci applications

Additional Options

• Ceramic Coating: See product code "PHC40"

Fitment Notes

• Designed for Chrysler Valiant Slant Six applications in the AP5, AP6, VC, VE and VF model range
• Check engine mounts, steering components, starter motor and surrounding clearances before final installation
• Clearance may vary where non-original engine mounts, steering components, transmissions or other modifications have been fitted
• Older vehicles can vary due to previous repairs, engine conversions or component changes, so confirm your vehicle configuration before ordering
• Professional installation is recommended

What’s Included

• 1 x PH2500 Pacemaker Headers

Recommended With

• Header / Manifold Gasket: See product code "DSF005"
• Exhaust Mounts: See product code "UNB002" / "RT1"
• Matching exhaust system or intermediate pipework may be available – contact us for advice

Why Good Headers & Exhaust Systems Matter

• At approximately 5,000 rpm, a 225ci Slant Six can draw around 9,000 litres of intake air per minute.
• At an exhaust gas temperature of approximately 600°C, this can expand to around 27,000 litres of exhaust gas per minute, demonstrating why efficient header and exhaust design is important for maintaining good cylinder scavenging and engine performance.

Warranty & Compliance

• Backed by Pacemaker’s 2-year manufacturer warranty
• Warranty applies according to Pacemaker's current manufacturer terms and conditions
• These applications are pre-1986 vehicles, so no modern emissions compliance statement is required
• Installation should be carried out correctly and adequate clearance maintained from wiring, hoses, brake components and other heat-sensitive parts

Frequently Asked Questions

Will these headers fit all Chrysler Valiant Slant Six models listed?
PH2500 headers are designed to suit the AP5, AP6, VC, VE and VF Chrysler Valiant Slant Six applications listed above. Vehicles that have been modified, converted or fitted with non-original components should be checked carefully before ordering.

Are these tuned-length headers?
Yes. Pacemaker PH2500 headers use a tuned-length design to improve exhaust scavenging, usable torque, throttle response and overall exhaust flow.

Are gaskets included?
Unless specifically stated as included in the product options, gaskets should be ordered separately. The recommended gasket for this application is product code DSF005.

Can these headers be ceramic coated?
Yes. Ceramic coating is available separately. See product code PHC40 or contact us for further information.

Will I need to modify my exhaust system?
Depending on the exhaust system currently fitted to the vehicle, connection or fabrication work may be required between the header outlets and the existing exhaust system. Contact us if you need advice on matching exhaust components.

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. We regularly ship exhaust components to the USA. International freight, U.S. customs duties, tariffs and any applicable clearance charges are additional. Please contact us or proceed through checkout for available freight options and current shipping information.

Customer Support

For phone orders, advice, or part enquiries – contact us: