Holden VN Heads 308 304 Air Gap Dual Plane Carby Intake Manifold

Unlock maximum power from your carburetted Holden V8 with the Holden VN Heads Air Gap Dual Plane Manifold. Engineered for classic VN-era performance, this natural cast, non-EFI intake manifold delivers a steady, even air and fuel flow across the RPM range for improved throttle response, smoother idle, and reliable mid-range power.

Key features

• Dual‑Plane configuration with Air Gap design to promote even distribution and cooling separation between intake air and engine heat
• Carburettor pad: square bore, compatible with modern aftermarket square-bore carburettors (manual or electric choke options)
• RPM operating range: 1500 to 6500
• Non-EGR, natural cast finish
• Port size: 1.19" x 2.09"
• Overall height (carb pad to bottom of manifold): 165mm (bonnet clearance should be checked)

Included and specifications

• Intake manifold gasket: 5REGIM-308VN
• Carburettor mounting studs: 5/16-18" (x4)
• Mounting holes: M6 x 1.00mm (x4)
• Ports: 1/4" NPT (x1), 3/8" NPT (x1) with steel port plug included, 1/2" NPT (x3) with 2 steel port plugs included
• Note: Port matching to cylinder heads is recommended for optimal performance

Fitment and compatibility

• Fits Holden 304 V8 engines
• Will not suit early Holden 308 cylinder heads
• Designed for late model Holden VN engine models (Non EFI)
• EFI version available separately (use A6010-4003 for EFI applications)
• In most cases, supports late model water necks, air conditioning, alternator, and HEI ignition systems

Performance notes and installation tips

• Air Gap design helps keep intake air cooler and reduces heat soak for more consistent power delivery
• Intake runners should be port matched to your cylinder heads for best results
• Check bonnet clearance before installation due to the 165mm overall height from carb pad to bottom
• This manifold is tailored for carburetted setups and is compatible with square-bore carburettors with either manual or electric choke