When it comes to building horsepower and torque, you need to start at the bottom and work your way up. Bullet-proof your LS engine's bottom-end with high quality components from Manley Performance. These fully balanced rotating assemblies are designed for performance enthusiasts wanting to get the most out of their engines.

Today, Manley Performance continues to re-define itself in a high performance aftermarket industry that is constantly evolving.They’ve developed new products for growing markets such as sport compact, Ford modular and Chevy LS; as well as maintained their leadership role with the traditional V8 engine business. This is the reason why we have carefully selected this renowned brand to supply us with these components that play a crucial role in an engine’s performance and driveability characteristics.

Stroking out the 5.7L LS1 V8 to no more than 383 cubic inches (6.3L) is fundamental in preserving its reliability. Unfortunately, given the manufacturing processes that were in place at the time of release, the cast iron cylinder liners could only be bored out by 0.010”. Anymore than this could potentially deform cylinder walls under high pressure, especially in boosted applications.

Unfortunately, Manley Performance does not have an off-the-shelf kit ready to go for the LS1. Therefore, we have taken the time and used our sought after automotive engineering background to select an appropriate combination from their custom parts list to suit both naturally aspirated and boosted setups.

Features:

Crankshaft

• 4” Super Light weight 4340 material forgings
• Multi-step heat treatment process and nitrided for added strength
• Stress relieved, shot-peened and 100% magnafluxed
• Micro polished large radius journals
• 24 tooth reluctor wheel
• Gun drilled mains and lightened rod journals for weight reduction
• Counter weights fully profiled

Pistons

• 3.905” High strength 2618 alloy forgings
• Exacting ring groove squareness to cylinder wall provides maximum horsepower
• Offset wrist pin design
• Premium chrome moly pin included with Standard series
• Moly coated skirts

Piston Rings

• 1.5 x 1.5 x 3mm Total Seal (molyin-lay tops standard)

Conrods

• Light weight design 4340 material forgings
• Fully machined, heat treated, stress relieved, shot-peened and 100% magnafluxed
• Big and small end bores are final honed to a tolerance of ± 0.0002"
• Bend and twist are tightly controlled
• Weight matched to +/- 1.5 grams
• H-Beam comes standard with low profile 7/16" ARP 8740 bolts providing additional block and oil pan clearance

Bearings

• Premium Clevite® “H” Series narrowed rod bearings and “H” Series main bearings

Vehicle Fitment Guide

Parts Guide

Please select the part number you require from the drop down menu by utilising our vehicle fitment guide and parts guide.

Notes:

• No balancing required. This kit comes with a fully balanced rotating assembly.
• Compression ratio is based off stock cylinder head combustion chamber volume of 66.67cc.
• Machining of the engine block is required. Please consult an engine builder prior to purchase to ensure your block is suitable.
• Valve train components, including camshafts and valve spring kits, can be purchased through other listings.

These genuine Bosch fuel injectors serve as a great upgrade for Gen III LS1 5.7L V8s. They use a 4-hole disc fuel delivery nozzle with a wide cone spray for maximum fuel atomization.

Specifications:

• Bosch part number: 0280155868
• Factory flow-matched sets (guaranteed to flow within 1-2% of each other)
• Injector body design: Metal and composite plastic
• Flow rate: 36lbs/hr, 380cc /min at 43.5 psi
• Fuel delivery: 4-hole disc
• Electrical connector type: EV1
• Length: 73 mm
• Body diameter: 16 mm
• O-rings: Top and bottom
• O-ring diameter: 14.5 mm
• Resistance: 12 Ohms
• Latency (dead time): 12 volts, 0.621 ms; 14 volts, 0.391 ms

These fuel injectors also make a great upgrade for other makes and models using the same electrical connector.

Vehicle Fitment Guide

Notes:

• A tune is mandatory if you are upgrading to these injectors.
• These injectors are also compatible with the Holden 5.0L but an additional groove for the injector clip will need to be cut. This is a straight forward modification if using a hack-saw.

Exclusive to Mace Engineering Group, our design-registered high performance cold air intake kit is one of the best bang for buck mods currently available for your Commodore and similar platforms fitted with Ecotec L36 and L67 Supercharged 3.8L V6 engines.
Not only will our cold air intake produce instant power gains but it will also enable you to extract more power from any further modification you may undertake; the higher the air demand, the more the factory system becomes a restriction.

This kit has been designed to increase the volumetric efficiency of your engine by increasing the density of air/oxygen present inside the cylinder after each intake stroke. This is due to a design which dramatically shortens the intake path and eliminates most of the obstacles air must pass through while making use of the large amount of cold air available behind the head light. In simple terms it has a similar effect to breathing in through a straw and then cutting the straw in half, considerably reducing the effort required to breathe. 

As an optional upgrade, we can swap the SAAS pod filter we supply for a genuine hi-flow K&N pod filter which features ultra-strong moulded pliable rubber flanges, excellent filtration and washable/reusable air filter media. All K&N air filters come with a one million kilometre manufacturer’s warranty so you can be assured your vehicle is being fitted with world class quality componentry. 

Key Benefits:

• Design registered.
• Genuine bolt on product which utilises only the existing factory air box mounting points and comes with everything required for installation.
• Available with either a SAAS pod filter or a K&N pod filter (optional extra) which offers superior flow and filtration characteristics compared to its counterpart.
• Huge cold air entrance, maximizing the amount of air captured behind the headlight region.
• Made from a heat resistant extruded ABS plastic, ensuring your filter remains cool maximizing power, unlike other steel or aluminium enclosures on the market.
• Stealth OEM appearance which won’t rust or discolour like powder coated or aluminium enclosures on the market.
• On road power gains of around +5kw at the rears are not uncommon, depending on modifications. 
• Opens up the door to further modifications.
• Improved drivability and throttle response.

Contents:

• 1 X Cold air intake enclosure (Black or clear, see parts guide)
• 1 X Black cover
• 1 X Clear cover (Optional, see parts guide) 
• 1 X Hi-flow pod filter
• 1 X K&N filter (Optional, see parts guide)
• 1 X Bolt pack

Vehicle Fitment Guide

Parts Guide

Please select the part number you require from the drop down menu by utilising our vehicle fitment guide and parts guide.
 

Notes: 

• The images are for illustrative purposes only.
• Detailed fitting instructions can be found on our website under Support.

This pair of rocker cover gaskets perfectly seals the covers to the cylinder heads and meets all OEM specifications. These gaskets have been manufactured from high grade automotive materials to ensure trouble-free motoring for all applications.

Vehicle Fitment Guide

Crow Cams hydraulic roller lifters are standard replacement lifters. With refined durability, they ensure valve-train stability in the most demanding conditions. These are a replacement for stock hydraulic roller lifters and preload is to be set to OEM specifications.

Vehicle Fitment Guide

If you own a Holden from VT to VZ and are looking to add additional gauges to your vehicle then this gauge holder is for you!

Key Features:

• Suitable for up to two 52mm gauges.
• Low profile design to minimise blind spots.
• Mounts directly over interior trim using 2 screws for fixture.
• Clean factory look.
• No visible wiring.
• Airbag compatible
• Retains factory grab handle.
• Designed and engineered in Australia.
• Gloss black with textured finish.
• Can be resprayed to match your vehicle's interior.

Contents:

• 1 X Pillar pod
• 1 X Instruction manual
• 2 X O-ring
• 2 X Rivet clip
• 2 X Cup spacer
• 2 X Gauge cup
• 2 X Stainless screw
• 2 X Stainless washer

Vehicle Fitment Guide

There are rules and regulations that cover the installation of aftermarket components in Australian road vehicles. As these rules differ from state to state, please check with your local transport authority for further information.

Note: The image is for illustrative purposes only.

Mace 1.9 ratio roller rockers (up from 1.65) with Crow Cams pushrods are suitable for Holden Commodore and similar platforms fitted with Ecotec (L36) or L67 supercharged V6 engines. This is a very cost effective way to bump up the performance of your vehicle, by increasing valve lift and allowing your engine to breathe much more efficiently.

Key Benefits:

• Gains of around 13 to 16kW are not uncommon. Higher in some cases where others mods have been undertaken.
• In addition to top end gains, excellent low to mid range power gains are also achieved with these rockers.
• It’s an easy DIY mod and takes around two hours to be done unlike a complete cam change. A cam change can take a good part of a day and is more complex to undertake meaning higher installation costs along with the cost of a retune which these rockers don't require, potentially saving you thousands!
• Unlike some aftermarket rockers these don't require spring upgrades as they best preserve the factory valve train harmonics, to prevent them from having valve float, hurting power and causing engine damage. Even when valve springs are upgraded (which is a costly exercise) to prevent this valve float from occurring, power output drops because the engine has to work against these stiffer springs. Basically, it can be a case of spending more money for less power than what these rockers have to offer!

Contents:

• 1 X High ratio roller rocker kit
• 1 X Bolt pack
• 1 X Assembly of 12 high ratio rocker
• 1 X Rocker lubricant
• 2 X Rocker pedestal
• 12 X Crow Cams pushrods 

​Vehicle Fitment Guide

Notes:

• Rockers with ratio higher than 1.9 are not suitable for use with an aftermarket camshaft unless the cam was designed for them because the excessive amounts of lift will potentially cause engine damage.
• The use of a thin walled pushrod is compulsory for all VY series Ecotec and L67 Supercharged V6 engines due to extra casting flash around the pushrod cavity. Earlier models are not prone to this issue and can re-use the standard pushrods with our high ratio rockers. These rockers only can be purchased through another listing.

Since the release of the Holden Ecotec V6, we have built up an extensive library of tunes to accommodate a variety of builds and configurations with exceptional results. Each project that we receive is carefully analyzed based on the custom tune form, the customer is required to fill out after making the purchase. Once we have verified that the information provided complies with our tuning capabilities, a specific tune file is selected and slightly tweaked to tailor it to the vehicles current setup. This alleviates all the compromises that were made by Holden in the engine calibration during mass production.

We can cater for most modifications, ranging from a simple cold air intake all the way through to a camshaft upgrade or L67 conversion which will yield improvements such as; refined fuel economy, smoother power delivery, greater throttle response and of course an increase in all out power and torque.

If the vehicle is equipped with an automatic transmission, the settings are revamped to provide firmer gear shifts by increasing the line pressures which render the gearbox more reliable in the long term. Other features like adjusting the fan enable temps can also be made.

Power output will differ from model to model however, in a fair comparison we usually see at least an 8kw gain at the rear wheels in an absolutely stock vehicle, meaning the more modifications that have been made, the higher the final power figure will be.
Fitment is simple, handled by even the most inexperienced DIY enthusiast in around 10-minutes with only basic tools. The factory ECU is located behind the kick-panel of the passenger side foot-well. The battery should be disconnected during the entire switch-over procedure.

Vehicle Fitment Guide

Notes:

• Our performance PCMs are limited in what they can cater for. If you're running forced induction, nitrous, have built a stroker, heavily modified cylinder heads or a running a camshaft that we don't stock, a custom dyno tune is required instead. We can recommend a workshop if that's the case.
• These re-calibrations can also cater for L67 conversions and transmission swaps. However, if you have a VS/VT V6 Commodore or factory L67, your ECU will be able to take our cheaper re-calibrated memcal instead. Please contact us for any questions or concerns.
• Once you have purchased your performance tune, please download this form complete it as accurately as possible and email it back to info@maceengineering.com.au
• Make sure your MAF sensor is clean before installing your upgraded PCM.
• Buyer is responsible for the packaging of ECU/PCM and covering the postage cost. It is recommended to use Australia Post registered post service for insurance and traceability purposes.
• These performance recalibrations can take up to 5 business days to program after we have received your tune form.

Exclusive to Mace Engineering, here we have our design-registered lower manifold insulators to suit the Holden VX and VY series, fitted with an Ecotec L36 3.8L 6 cylinder engine.

What are manifold insulators and what do they do?

Manifold insulators are a thermal insulating spacer that mount between your engine block and intake manifold. Made from a heat blocking composite, our manifold insulators will increase power from your engine by keeping the intake cooler and increase low end torque by increasing runner length.

But how do manifold insulators keep the intake manifold cooler?

Given our manifold insulators are made from a composite material with a thermal conductivity of 0.29 W/m*K as opposed to aluminium, which has a thermal conductivity of 150 W/m*K; The difference works about to be that aluminium conducts heat 500 times higher than our composite material!

Also, with gaskets often made out of steel (thermal conductivity of 20 W/m-K) placed between the upper and lower manifolds being 0.5mm thick, replacing them with a manifold insulator will conduct up to an amazing 3,448 times less heat depending on the size chosen.

Our composite material also exhibits high stiffness and compressive strength, can withstand temperatures up to 150°C, and has a thermal expansion coefficient very similar to aluminium to increase sealing capabilities. In addition, the spacer can also withstand boosted conditions with ease.

Dyno Results:

The following test was conducted on a 1996 Holden Commodore VS with head and cam work. Normally the problem of low down torque is made worse when you stick a larger cam (with more overlap) in any engine as you effectively shift the power band. However by looking at the graph, we can see that power produced down low had increased by a staggering 10% using only our 12mm manifold insulator, with top-end increasing by a further 2kw at the rears! Please note that these results don't reflect the true nature of the on road gains given the lack of actual airflow, which further drop inlet temps.

Under normal driving conditions the plenum (upper manifold), with the insulator in place, becomes cool enough to comfortably touch. Unlike before, without the manifold insulator under the same driving conditions, making it very difficult to touch without getting burned!

POWER RUN, BEFORE AND AFTER MANIFOLD INSULATOR

Key Benefits:

• Design registered.
• Reduces charge air temperature resulting in better power consistency and detonation prevention.
• Power increase with no undesirable side effects.
• Improved low end torque by increasing runner length.
• Improved fuel economy.
• Easy to install.
• Can be used as a replacement gasket.
• Reusable.
• Proven gains at an affordable price.

Contents:

• 1 X Manifold insulator
• 1 X Bolt pack
• 1 X Silicone gasket maker
• 1 X Mace sticker

​Vehicle Fitment Guide

Parts Guide

Please select the part number you require from the drop down menu by utilising our vehicle fitment guide and parts guide.

Notes:

• To achieve optimum performance on a naturally aspirated engine, we recommend running a 25mm manifold insulator and a 12mm plenum spacer. However, for forced induction (side mount supercharger or turbo) we recommend running a 12mm manifold insulator and a 25mm plenum spacer.
• Please confirm your intake runner profile prior to purchase as there was a design change in later model engines.
• Manifold insulator for WH Caprice/Statesman released before August 2000 can be purchased through another listing.

Exclusive to Mace Engineering is our design-registered plenum spacer to suit Holden Ecotec 3.8L V6 engines.

What is a plenum spacer and what does it do?

A plenum spacer thermally separates the plenum cover and intake manifold. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result there is less of a pressure drop inside the plenum chamber between cylinders, and less air momentum, resulting in better air distribution and power. The change in airflow characteristics is shown in the diagram below.

Not only will our spacer help you make more power, it will also help prevent any costly rebuilds through dangerous lean outs that occur due to poor air distribution with standard manifolds in high horsepower/boost applications.

In addition to improving air distribution between cylinders, the increase in plenum volume also has a positive effect on bottom end torque.

The fact these spacers are manufactured from the same thermal resistant composite material as our manifold insulators means further horsepower gains are possible due to the reduction in heat soak. 

Key Benefits:

• Design registered.
• Reduces charge air temperature resulting in better power consistency and detonation prevention.
• Power increase with no undesirable side effects.
• Improved air distribution between each cylinder.
• Improved fuel economy.
• Easy to install.
• Can be used as a replacement gasket.
• Reusable.
• Proven gains at an affordable price.

Contents:

• 1 X Plenum spacer
• 1 X Bolt pack
• 1 X Silicone gasket maker

Vehicle Fitment Guide

Parts Guide

Please select the part number you require from the drop down menu by utilising our vehicle fitment guide and parts guide.

Notes: 

• The 25mm plenum spacer is recommended for turbo or supercharged applications only.
• Installation is very straight forward, requiring only the removal of your plenum cover to install the plenum spacer.