Holden Commodore VB-VK 304 5.0L EFI 308 EFI Heads Pacemaker Headers PH5700

Pacemaker PH5700 headers (extractors) are designed for Holden Commodore VB, VC, VH and VK fitted with a VN-VT 304 5.0L EFI Holden V8 engine or 308 Holden V8 fitted with EFI cylinder heads.

Pacemaker PH5700 uses a Tri-Y design with larger 44mm (1¾") primary pipes, 51mm (2") secondary pipes and 57mm (2¼") outlets. This combination makes PH5700 particularly suitable for performance-oriented EFI Holden V8 conversions where improved exhaust flow is required.

IMPORTANT – Will not fit with a manual steering K-frame. Pacemaker also lists PH5700 as suitable for VL Commodore when fitted with a VN-VS steering rack.

Please check availability and current lead time before ordering.

Key Features

• Designed for early Commodore with later Holden EFI V8 engine or cylinder heads
• Tri-Y header design
• 44mm (1¾") primary pipes
• 51mm (2") secondary pipes
• 57mm (2¼") outlets
• Suits VN-VT 304 5.0L EFI Holden V8 engine conversions
• Suits 308 Holden V8 fitted with EFI cylinder heads
• Manual and automatic transmission applications
• Power steering compatible with the correct steering/K-frame configuration
• Air conditioning compatible
• Oxygen sensor provision

Construction

PH5700 uses Pacemaker's Tri-Y configuration with 44mm (1¾") primary pipes feeding into 51mm (2") secondary pipes and 57mm (2¼") outlets.

The standard headers are supplied in Pacemaker's distinctive protective blue finish.

Additional Options

Ceramic Coating: Ceramic coating may be available as an option for improved heat management and corrosion resistance. Please contact Best Mufflers for current availability.

DSF63: Pacemaker currently specifies DSF63 as the replacement exhaust manifold/header gasket for PH5700.

Vehicle Fitment

• Holden Commodore VB: 1978-1980 – EFI Holden V8 conversion
• Holden Commodore VC: 1980-1981 – EFI Holden V8 conversion
• Holden Commodore VH: 1981-1984 – EFI Holden V8 conversion
• Holden Commodore VK: 1984-1986 – EFI Holden V8 conversion
• Engine: VN-VT 304 5.0L EFI Holden V8
• Alternative Engine: 308 Holden V8 fitted with EFI cylinder heads
• Transmission: Manual / Automatic – see gearbox compatibility below
• Drive: Rear-Wheel Drive

Important: PH5700 is primarily an engine-conversion header. The 304 EFI engine was not the original factory engine in VB-VK Commodores, so the complete engine, steering, K-frame and transmission configuration must be checked before ordering.

Header Specifications

• Part Number: PH5700 L/R
• Brand: Pacemaker
• Design: Tri-Y
• Primary Pipe: 44mm (1¾")
• Secondary Pipe: 51mm (2")
• Outlet: 57mm (2¼")
• Power Steering: Yes
• Air Conditioning: Yes
• Oxygen Sensor Provision: Yes
• EGR: N/A
• Replacement Gasket: DSF63
• Approximate Fitting Time: 3 hours

Gearbox Compatibility

• Australian 4-speed with cable clutch
• Commodore VN-VS 5-speed
• Toyota Supra 5-speed with Hatfield bellhousing and crossmember
• Holden Trimatic
• Turbo 350 automatic
• Turbo 400 automatic
• Turbo 700 4-speed automatic
• Commodore Getrag 5-speed (VT gearbox)
• Ford Top Loader

Fitment Notes

Manual Steering K-Frame: Pacemaker specifically states that PH5700 will not fit with a manual steering K-frame.

VL Commodore: Pacemaker's current application information states PH5700 will fit VL when fitted with a VN-VS steering rack. Because this is dependent on the steering and conversion configuration, please confirm the complete vehicle setup before ordering.

High-Torque Starter: Existing PH5700 application information lists compatibility with a high-torque starter motor.

Engine Conversion: Engine mounts, K-frame, steering rack, transmission, bellhousing, starter motor and other conversion components can affect clearance.

Protect painted surfaces during trial fitting and check steering, starter motor, transmission, engine mount and exhaust clearances before final tightening.

What's Included

• Pacemaker PH5700 left-side header assembly
• Pacemaker PH5700 right-side header assembly

Do not assume header bolts, gaskets or other installation hardware are included unless specifically confirmed with the current kit before ordering.

Recommended With

• DSF63 exhaust manifold/header gaskets
• Suitable downstream exhaust connections to match the 57mm (2¼") header outlets

Why Good Headers & Exhaust Systems Matter

At 4,000 rpm, the 5.0L Holden V8 theoretically draws approximately 10,000 litres of intake air per minute at 100% volumetric efficiency and expels around 30,000 litres of hot exhaust gas per minute at approximately 600°C.

Actual airflow varies with engine specification, RPM, volumetric efficiency, camshaft, cylinder heads, induction system and engine tune.

A well-designed header and exhaust system helps manage this high gas flow efficiently, reducing restriction and improving exhaust scavenging, torque, throttle response and engine performance.

Installation Tips

PH5700 is an engine-conversion header, so confirm the complete engine, K-frame, steering rack and transmission configuration before installation.

Pacemaker lists an approximate fitting time of 3 hours. Actual installation time can vary considerably depending on the vehicle and conversion components.

Professional installation is recommended, particularly where the vehicle has a non-standard engine, transmission, steering or K-frame configuration.

Warranty & Compliance

Pacemaker headers are covered against manufacturing defects subject to Pacemaker's current warranty terms and conditions.

Because PH5700 is intended for an engine conversion, the completed vehicle must comply with applicable state or territory requirements covering engine conversions, emissions, exhaust noise and vehicle modifications.

Any catalytic converters, oxygen sensors and emissions-control equipment required for the engine and vehicle must remain correctly installed and operational.

FAQ

What vehicles do PH5700 headers suit?
Pacemaker currently lists PH5700 for Holden Commodore VB, VC, VH and VK fitted with a VN-VT 304 5.0L EFI Holden V8 or a 308 Holden V8 fitted with EFI cylinder heads.

Does PH5700 suit a 253 Holden V8?
Pacemaker's current PH5700 application does not list the standard 253 V8. PH5700 is intended for the 304 5.0L EFI engine or 308 fitted with EFI cylinder heads.

Are PH5700 headers Tri-Y?
Yes. Pacemaker's current specification identifies PH5700 as a Tri-Y design.

What size are PH5700 headers?
Pacemaker specifies 44mm (1¾") primary pipes, 51mm (2") secondary pipes and 57mm (2¼") outlets.

Will PH5700 fit a VK Commodore?
Yes. Pacemaker's current application specifically includes VK Commodore, subject to the required engine and steering configuration.

Will PH5700 fit a VL Commodore?
Pacemaker currently states that PH5700 will fit VL with a VN-VS steering rack. The complete steering, K-frame and engine conversion configuration should be confirmed before ordering.

Will PH5700 fit a manual steering K-frame?
No. Pacemaker specifically states that PH5700 will not fit with a manual steering K-frame.

Will PH5700 fit with air conditioning?
Yes. Pacemaker lists PH5700 as air-conditioning compatible.

Does PH5700 have an oxygen sensor provision?
Yes. Pacemaker lists oxygen sensor provision for PH5700.

What gasket suits PH5700?
Pacemaker currently specifies DSF63.

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

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