RVN 355
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- 91 VN SS 355
Hey guys will be purchasing a larger better flowing manifold for my 355ci stroker VN SS EFI which one do i get and why?
1. Come Racing Twin Throttle Efi Manifold $2500
A two year dyno development program yielded the C.O.M.E. Racing Twin Throttle Body EFI manifold which has now become the top selling intake for the EFI Holden V8s in Australia.
This manifold has revolutionised the power potential of the Holden EFI V8 and enabled power gains never before possible, even compared to the factory Group-A VL and VN manifolds.
2.Trick Shift Twin Throttle Manifold
Our Twin Throttle body manifold suits Injected 5lt Commodores only fron VN - VT series 1.
It has 2 progressive 60mm throttle bodies, uses the standard fuel rail, has easy distributor access, is made from cast alloy, bolts straight on & fits under the bonnet. ( Please note some vs & vt may have to slightly modify a bonnet spar)
You will need to modify your air box & replace valley gasket.
The manifold has been designed for bottom end performance & has it right thru to mid range & top end.
Power increases will vary depending on your engine applications. On testing this manifold on a stock 5lt we had a 20% power increase. Happy customers have reported they to have got the power increase & better fuel economy.
The package we have available includes the following: 1 x manifold, 2 x 60mm Throttle bodies, 1 x new gm throttle cable & 2 x pieces of black ducting. Valley Gasket & air box adaptor are available for a little extra.
We do also offer a change over deal for your standard manifold & v8 throttle body, providing your manifold is not corroided out or damaged in any way.
Item can be sent anywhere in Australia & Tasmania. Price can be quoted when you give us your post code.
For more detailed specs & prices on the manifold please dont hesitate to contact us & we can discuss in
detail with you all the information.
3.Torque-Power VN-VT Dual Plane Intake Manifold $950 EFI
For performance in high performance street, drag and boat engines, choose Touque-Power aluminum intake manifolds.
This dual plane high-rise split level manifold is the latest in 'State of the Art' technology.
From 1500 RPM 6500-RPM Torque-Power dual plane manifolds offer incredible torque and throttle response with plenty of top end power.
Torque-Power has achieved 400 HP 6000 RPM at 389 FT LB of torque at 4250 RPM. This was possible with a Torque-Power 308 CU IN Dyno Proven Power Package Kit.
All Torque-Power dual plane manifolds are non E.G.R.
Torque-Power in conjunction with Micron Competition Engines have spent many hours in extensive flow and dyno testing to develop and patent a split level exit to the Torque-Power dual plane intake manifold to suit 308 EFI heads.
This design allows the eight intake runner to flow within 1-2 CFM out of the box. Port machining is not as important as is required on the other brands of intake manifolds.
Manifold to suit EFI V8 Holden cylinder head only
Split port level EXIT Design
The eight Intake Runner's Flow within 2 - 3 CFM of each other
Bosse's for EFI injector's or Nitrous Oxide nozzles if required
Over all height of manifold at front is 5 1/8
4.Harrop Single Plain$1000 DRILL TO SUIT EFI
Fuel rail, throttle body and injectors are not included in the price of the Dual Plane manifold.
Ports designed for maximum torque and horsepower
Cast with bosses for use with EFI injectors or N2O nozzles if required
180mm overall height at front
Holley stud pattern
Mass: 10kg
Ideally suited for Top end horsepower and torque
• In house casting and heat treating to aeronautical standards
• Precision CNC machining
• Dimensions: Height approx. 180mm from block face to carburettor face
• Optimal performance gain between 3,500 and 7,000 rpm
• Can be machined to suit fuel injection
• This manifold has been developed in conjunction with the dual plane manifold using the same
Harrop racing DNA to deliver the performance enthusiast with a quality enhanced product
5. STARR MANIFOLD
Manifold and Throttle Body
For many years, Holden enthusiasts have been looking for a replacement manifold for their EFI V8’s. The standard manifold and throttle body doesn’t supply the engine with the air volume required for high power outputs. The original 65mm throttle body and intake design only flows 580CFM.
The Starr manifold and throttle body conversion transforms power and torque of the EFI Holden V8 (VN – VT1), fits under the bonnet, looks standard and flows 1200CFM. It is the perfect replacement manifold for anybody looking to achieve a simple gain over standard, or for the enthusiast who is building a 400HP stroker. Best yet, is the price. At $1,450 (change over), no other manifold offers the same performance gain for the price.
15kw @ flywheel is achievable by bolting onto a stock 5.0L. However, up to 40kw @ flywheel is achievable on a big cammed stroker. We recommend that the manifold be used with our custom cold air box and a reprogrammed chip.
6.Walker Twin Throttle $2400
Twin throttle body manifold for Commodore VN-VT 5L injection style heads, as seen in March issue of Street Machine magazine, comes with manifold base, sheetmetal plenum, twin 60mm throttle bodies, modified fuel rails and all nuts bolts and gaskets. Factory harness requires very minor modification (extension of TPS plug by 120mm). Plenum and fuel rails have been fully polished. ECM remap recommended for best results
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