The Harrop Dual Plane manifold has been developed using years of racing experience to deliver the performance enthusiast with a quality enhancement product.
It is the perfect performance manifold for any Holden vehicle fitted with legendary Holden V8 engine and late model heads, the low height provides excellent bonnet clearance for the stealth look. The Dual Plane manifold available in both carburetor and injected versions exploits the benefits of low-end torque and while still flowing well at higher RPM.
These units have a height of 120mm from base of manifold to pad height and have a large efficiency range from 1000rpm to 5500rpm.
They are perfect on the street in stop-and-go driving, and they yield plenty of power when it's time to put the throttle down off the line.
Engine/Carby Applications:
Holden cast iron V8 with late model EFI heads. (Injected version incurs additional fee)
Pad pattern suits Holley 4150/4160 Square Bore & Quadrajet Spread Bore