V8 Torana Hatch with the lot
DraftHolden UC · Built by Heath · blog
The UC Holden Torana Hatchback occupies a special place in Australian motoring culture — a lightweight, rear-drive platform that factory race teams campaigned with ferocity in the 1970s. Heath's example takes that heritage seriously, wearing a full conversion to LX A9X specification, the most aggressive factory body kit the Torana line ever produced, complete with period-correct front and rear lighting and the iconic deep chin and rear spoiler treatment. The result is a car that looks as though it rolled straight out of a Bathurst pit garage, reborn with modern intent.
Heath's build philosophy is one of thoroughness over speed. Eight years of incremental, well-documented development means nothing was bolted on without purpose, and nothing was rushed. Starting as a daily driver, the car gradually shed compromise at every stage — weight was extracted via the 'swiss-cheese method' of systematic lightening, the interior and structure pared back with the discipline of a racer, while the exterior was elevated to show-car standard with a jaw-dropping 80s-inspired colour combination.
The heart of the build is a 383 cubic inch Holden V8 fed through individual throttle bodies and running on straight LPG — an unconventional but characterful fuel choice that suits the old-school flavour of the project. Behind it sits a Tremec TKO 600 five-speed manual, a modern gearbox that brings reliable close-ratio shifting to a platform that originally made do with far cruder internals. A custom sunroof, grafted in using a Porsche 944 unit and executed entirely in metal, speaks to the level of fabrication skill and ambition at work here.
Rolling on 16×10 and 17×12 Panasport G7 C5R wheels — racing-lineage rubber-stretchers that fill the A9X arches with authority — the Torana presents a complete package: purposeful, period-correct in attitude, and genuinely fast. This is what happens when a builder refuses to cut corners and refuses to stop.
Every single modification has been thoroughly documented over 70+ pages — get yourself a warm or cold beverage, find a comfortable place to sit down, and get lost in 8 years of pure car-building nirvana.
- —Convert bodywork to full LX A9X specification
- —Build a high-output 383ci Holden V8 on LPG with ITBs
- —Significant weight reduction throughout the car
- —Install a modern Tremec TKO 600 five-speed manual
- —Create a show-quality 80s-inspired livery and presentation
- —Make the car track-capable as well as show-worthy
- —Document every modification in detail over the full build journey
Engine & Power
Provenest · reviewA 383ci Holden V8 running on straight LPG with individual throttle bodies forms the centrepiece of this build, delivering a strong torque curve and aggressive throttle response in an unconventional but deeply characterful package.
Parts
$8,000
Labour
$3,500
Total
$11,500
Holden
383ci V8 Engine
4.7 ★
Individual Throttle Bodies (ITBs)
4.5 ★
- 383ci displacement provides strong low-end torque
- ITBs deliver excellent throttle response and induction sound
- LPG fuel system is cost-effective and period-appropriate
- Holden V8 has extensive aftermarket support in Australia
- LPG requires dedicated fuel system and tank packaging
- ITBs require careful tuning to deliver smooth idle and full-range performance
- 383ci stroker reliability depends heavily on build quality
- Estimated 350-400hp on LPG with ITBs
- Significant torque increase over stock Holden 6 or small-block V8
- ITBs improve throttle response across the rev range
- Improves top-end power by reducing intake restriction
- Individual runners eliminate shared plenum losses
- Enhances power output across the rev range
- Induction roar from ITBs is a defining character trait
- Strong mid-range pull suits street and track use
- LPG delivery is smooth once properly tuned
- Linear, immediate throttle response
- Induction howl is spectacular at high revs
- Transforms the character of the engine
- Holden V8 architecture is well-understood and robust
- Stroker builds can be reliable with quality internals and good tuning
- LPG is clean-burning and can extend engine life
- No single points of failure in the intake path
- Throttle bodies themselves are simple and robust
- Linkage and balance settings can shift over time
- Requires custom engine mounts for UC Torana fitment
- LPG system adds complexity to fuel plumbing
- ITB setup requires individual linkage and balance tuning
- Requires custom intake manifold or adapter
- Each throttle body must be synchronised
- LPG injection points must be positioned carefully
- LPG stations less common than petrol — plan routes accordingly
- ITBs are sensitive to air leaks; regular checks recommended
- Stroker clearancing of block is essential
- Idle quality is harder to achieve than with a single throttle body
- Cold start can be challenging without proper setup
- Regular synchronisation checks are recommended
- vs carburetted V8: ITBs provide superior throttle response and top-end breathing
- vs fuel injection: ITBs are more complex to tune but more rewarding
- vs smaller displacement: 383ci delivers torque without needing high revs
- vs single carburettor: ITBs provide superior response and top-end flow
- vs EFI plenum: ITBs are more complex but more characterful
- vs turbo intake: ITBs are naturally aspirated focused, suited to this build's intent
- Use a specialist LPG tuner with V8 experience
- Balance ITBs carefully using vacuum gauges or a flow bench
- Ensure adequate cooling given LPG combustion characteristics
- Use a quality linkage kit designed for the engine's V8 firing order
- Tune on a dyno with an experienced operator familiar with ITB setups
- Consider velocity stacks for maximum effect and airflow
- Builders wanting maximum character alongside performance
- Track and show builds where sound and response matter
- Those comfortable with specialist LPG tuning
- Naturally aspirated high-revving builds
- Show and track cars where sound is important
- Builders willing to invest time in setup and tuning
Intake & Exhaust
Popularest · reviewThe ITB induction system provides direct airflow to each cylinder independently, while the V8's exhaust note on a lightweight Torana is a key part of the build's sonic character.
Parts
$2,500
Labour
$1,200
Total
$3,700
LPG Fuel System (straight LPG)
4 ★
- ITB induction is both functional and spectacular sounding
- V8 exhaust note well-suited to the lightweight Torana body
- Unrestricted breathing supports strong power output
- Exhaust system details not specified in source
- LPG-specific intake routing adds complexity
- High octane LPG supports aggressive ignition timing
- Slightly lower energy density than petrol but compensated by tuning
- Consistent fuel quality aids tuning stability
- No perceptible difference to the driver once tuned
- Cold start can require more attention
- Range may vary versus petrol depending on tank size
- LPG systems are mature and reliable when well-maintained
- Fewer fuel system corrosion issues than petrol
- Regulators and vapourisers require periodic service
- LPG tank must be installed in a compliant location
- Fuel lines must be LPG-rated and properly routed
- Requires LPG-certified installation in most jurisdictions
- LPG availability varies by region — plan accordingly
- Not all workshops are familiar with LPG performance tuning
- Ensure cylinder is within hydrostatic test date
- vs petrol: lower cost per litre, higher octane, slightly less energy density
- vs dual-fuel: simpler system, more committed, less flexibility
- vs E85: LPG is more widely available in Australia for this era of build
- Use an experienced LPG tuner with V8 ITB knowledge
- Ensure tank is appropriately sized for the intended use (track vs street)
- Regular regulator and injector servicing is essential
- Builders in regions with good LPG infrastructure
- Those seeking lower running costs on a performance build
- Committed builds where dual-fuel complexity is not desired
Drivetrain
Provenest · reviewThe Tremec TKO 600 five-speed manual replaces the original gearbox, bringing modern close-ratio shifting, increased torque capacity, and improved durability to the classic Torana platform.
Parts
$4,500
Labour
$1,800
Total
$6,300
Tremec
TKO 600 5-speed Manual Transmission
4.8 ★ · MSRP $3,200
- Tremec TKO 600 is a well-proven, high-torque-capacity unit
- Five close-ratio gears keep the V8 in its power band
- Bolt-in adapter solutions available for Holden applications
- Dramatically more reliable than period-correct Holden gearboxes
- Requires custom bellhousing or adapter plate
- Tunnel modifications may be needed for correct fitment
- Higher cost than rebuilding original gearbox
- Keeps engine in power band with close-ratio gearing
- Eliminates power losses from worn synchros in vintage gearboxes
- Overdrive ratio improves highway cruising efficiency
- Precise, positive shift action versus vintage Holden boxes
- Shorter throws available with aftermarket shifter
- Confidence-inspiring under hard acceleration
- Tremec is an OEM supplier with proven durability
- TKO 600 is rated well above the engine's torque output
- Widely supported for rebuilds and parts
- Requires correct bellhousing or adapter for Holden V8
- Driveshaft length adjustment typically required
- Tunnel clearance should be verified before installation
- Confirm correct tailshaft yoke compatibility
- Hydraulic clutch conversion recommended for cleaner installation
- Gear ratios should be matched to rear axle ratio and tyre diameter
- vs Muncie 4-speed: TKO adds overdrive and greater torque capacity
- vs T56 Magnum: TKO is more affordable and better suited to moderate power levels
- vs rebuilt Holden box: TKO offers far superior shift quality and reliability
- Pair with a quality clutch kit rated for the engine's torque
- Use a short-throw shifter for best driving feel
- Verify bellhousing alignment with a dial indicator before final installation
- High-torque classic V8 builds
- Builders who want modern reliability in a vintage car
- Track and street dual-purpose applications
Suspension
Emergingest · reviewWhile specific suspension components are not detailed in the source, the track-oriented intent of the build combined with substantial weight reduction implies a performance-tuned suspension setup appropriate for both show and circuit use.
Parts
$3,000
Labour
$1,500
Total
$4,500
Suspension Setup (performance-oriented)
4 ★
- Weight reduction via swiss-cheese method directly improves suspension response
- Lighter unsprung and sprung mass benefits all suspension dynamics
- Large wheel and tyre package implies suspension geometry work
- Specific suspension components not specified in source
- Performance suspension will reduce ride comfort on road
- Reduced vehicle mass amplifies suspension effectiveness
- Wide rubber requires appropriate roll stiffness
- Track-tuned setup improves lap times significantly
- Stiffer setup provides excellent body control
- Reduced dive and squat under braking and acceleration
- More communicative feel versus stock rubber mounts
- Performance components generally more durable under track loads
- Stiffer bushings reduce compliance wear over time
- Geometry adjustment required to suit wide wheels
- Corner weighting recommended for track use
- Alignment must be set to suit intended use
- UC Torana suspension geometry has known limitations that may require aftermarket correction
- Spring rates must suit both street and track compromise
- Check clearances carefully with 17x12 rear wheels
- vs stock Torana suspension: dramatically improved in all metrics
- vs coilover conversion: depends on specific components chosen
- vs standard leaf rear: upgraded setup offers far better control
- Invest in a corner weight session after full build completion
- Use alignment settings biased toward understeer for track safety
- Check and re-
- Track-focused builds with occasional street use
- Drivers who prioritise handling over ride comfort
- Builds where weight reduction is a core goal
Engine & Power
2 partsA 383ci Holden V8 running on straight LPG with individual throttle bodies forms the centrepiece of this build, delivering a strong torque curve and aggressive throttle response in an unconventional but deeply characterful package.
Holden
383ci V8 Engine
Core powerplant of the build, displacing 383 cubic inches and fuelled by straight LPG with individual throttle bodies.
Why This Part
The 383ci Holden V8 is a proven stroker displacement for the platform, offering substantial torque and power while maintaining period-correct character.
- Large displacement = abundant torque
- Strong aftermarket parts availability in Australia
- Sounds incredible with ITBs
- Stroker builds require precise machining tolerances
- LPG tune requires specialist knowledge
- Estimated 350-400hp on LPG with ITBs
- Significant torque increase over stock Holden 6 or small-block V8
- ITBs improve throttle response across the rev range
- Induction roar from ITBs is a defining character trait
- Strong mid-range pull suits street and track use
- LPG delivery is smooth once properly tuned
- Holden V8 architecture is well-understood and robust
- Stroker builds can be reliable with quality internals and good tuning
- LPG is clean-burning and can extend engine life
- Requires custom engine mounts for UC Torana fitment
- LPG system adds complexity to fuel plumbing
- ITB setup requires individual linkage and balance tuning
- LPG stations less common than petrol — plan routes accordingly
- ITBs are sensitive to air leaks; regular checks recommended
- Stroker clearancing of block is essential
- vs carburetted V8: ITBs provide superior throttle response and top-end breathing
- vs fuel injection: ITBs are more complex to tune but more rewarding
- vs smaller displacement: 383ci delivers torque without needing high revs
- Use a specialist LPG tuner with V8 experience
- Balance ITBs carefully using vacuum gauges or a flow bench
- Ensure adequate cooling given LPG combustion characteristics
- Builders wanting maximum character alongside performance
- Track and show builds where sound and response matter
- Those comfortable with specialist LPG tuning
Individual Throttle Bodies (ITBs)
Fitted to the 383ci V8 running on straight LPG, providing direct throttle response and a spectacular induction sound.
Why This Part
ITBs maximise volumetric efficiency on a naturally aspirated engine and are a hallmark of serious performance builds, particularly on V8s intended for track use.
- Dramatic improvement in throttle response
- Allow each cylinder to breathe independently
- Iconic induction sound on V8 engines
- Complex linkage setup required
- Requires careful individual balancing
- Can be difficult to tune for smooth idle
- Improves top-end power by reducing intake restriction
- Individual runners eliminate shared plenum losses
- Enhances power output across the rev range
- Linear, immediate throttle response
- Induction howl is spectacular at high revs
- Transforms the character of the engine
- No single points of failure in the intake path
- Throttle bodies themselves are simple and robust
- Linkage and balance settings can shift over time
- Requires custom intake manifold or adapter
- Each throttle body must be synchronised
- LPG injection points must be positioned carefully
- Idle quality is harder to achieve than with a single throttle body
- Cold start can be challenging without proper setup
- Regular synchronisation checks are recommended
- vs single carburettor: ITBs provide superior response and top-end flow
- vs EFI plenum: ITBs are more complex but more characterful
- vs turbo intake: ITBs are naturally aspirated focused, suited to this build's intent
- Use a quality linkage kit designed for the engine's V8 firing order
- Tune on a dyno with an experienced operator familiar with ITB setups
- Consider velocity stacks for maximum effect and airflow
- Naturally aspirated high-revving builds
- Show and track cars where sound is important
- Builders willing to invest time in setup and tuning
Intake & Exhaust
1 partsThe ITB induction system provides direct airflow to each cylinder independently, while the V8's exhaust note on a lightweight Torana is a key part of the build's sonic character.
LPG Fuel System (straight LPG)
The entire 383ci V8 runs on straight LPG — not dual-fuel — which is an unconventional but committed choice that suits the build's character.
Why This Part
Running straight LPG simplifies the fuel system versus dual-fuel setups, reduces running costs, and keeps octane levels high for the performance engine.
- High octane rating suits performance engine
- Lower fuel cost than premium petrol
- Clean combustion can extend engine life
- LPG availability is decreasing in some regions
- Tank takes up boot/storage space
- Specialist tuning required for ITB compatibility
- High octane LPG supports aggressive ignition timing
- Slightly lower energy density than petrol but compensated by tuning
- Consistent fuel quality aids tuning stability
- No perceptible difference to the driver once tuned
- Cold start can require more attention
- Range may vary versus petrol depending on tank size
- LPG systems are mature and reliable when well-maintained
- Fewer fuel system corrosion issues than petrol
- Regulators and vapourisers require periodic service
- LPG tank must be installed in a compliant location
- Fuel lines must be LPG-rated and properly routed
- Requires LPG-certified installation in most jurisdictions
- LPG availability varies by region — plan accordingly
- Not all workshops are familiar with LPG performance tuning
- Ensure cylinder is within hydrostatic test date
- vs petrol: lower cost per litre, higher octane, slightly less energy density
- vs dual-fuel: simpler system, more committed, less flexibility
- vs E85: LPG is more widely available in Australia for this era of build
- Use an experienced LPG tuner with V8 ITB knowledge
- Ensure tank is appropriately sized for the intended use (track vs street)
- Regular regulator and injector servicing is essential
- Builders in regions with good LPG infrastructure
- Those seeking lower running costs on a performance build
- Committed builds where dual-fuel complexity is not desired
Drivetrain
1 partsThe Tremec TKO 600 five-speed manual replaces the original gearbox, bringing modern close-ratio shifting, increased torque capacity, and improved durability to the classic Torana platform.
Tremec
TKO 600 5-speed Manual Transmission
Chosen to handle the torque output of the 383ci V8 and provide a modern, reliable close-ratio manual gearbox experience.
Why This Part
The TKO 600 is the go-to modern manual for classic American and Australian V8 swaps — rated to 600 lb-ft, it matches the engine's output with room to spare and brings synchronised shifts that period gearboxes cannot match.
- 600 lb-ft torque rating is ample for the 383ci build
- Five forward speeds with overdrive option
- Excellent shift quality versus vintage Holden boxes
- Strong aftermarket support and rebuild availability
- Requires adapter/bellhousing for Holden V8 mating
- Heavier than some alternatives
- Premium price compared to sourcing a used Holden unit
- Keeps engine in power band with close-ratio gearing
- Eliminates power losses from worn synchros in vintage gearboxes
- Overdrive ratio improves highway cruising efficiency
- Precise, positive shift action versus vintage Holden boxes
- Shorter throws available with aftermarket shifter
- Confidence-inspiring under hard acceleration
- Tremec is an OEM supplier with proven durability
- TKO 600 is rated well above the engine's torque output
- Widely supported for rebuilds and parts
- Requires correct bellhousing or adapter for Holden V8
- Driveshaft length adjustment typically required
- Tunnel clearance should be verified before installation
- Confirm correct tailshaft yoke compatibility
- Hydraulic clutch conversion recommended for cleaner installation
- Gear ratios should be matched to rear axle ratio and tyre diameter
- vs Muncie 4-speed: TKO adds overdrive and greater torque capacity
- vs T56 Magnum: TKO is more affordable and better suited to moderate power levels
- vs rebuilt Holden box: TKO offers far superior shift quality and reliability
- Pair with a quality clutch kit rated for the engine's torque
- Use a short-throw shifter for best driving feel
- Verify bellhousing alignment with a dial indicator before final installation
- High-torque classic V8 builds
- Builders who want modern reliability in a vintage car
- Track and street dual-purpose applications
Suspension
1 partsWhile specific suspension components are not detailed in the source, the track-oriented intent of the build combined with substantial weight reduction implies a performance-tuned suspension setup appropriate for both show and circuit use.
Suspension Setup (performance-oriented)
Not specified in detail in the source; inferred from the track-attack intent and wheel/tyre fitment of the build.
Why This Part
A track-capable build on wide Panasport wheels requires suspension geometry and spring/damper rates tuned to suit the added lateral grip and reduced vehicle mass.
- Supports wide wheel and tyre fitment
- Allows track-focused alignment settings
- Benefits from significant weight reduction
- Details not confirmed in source
- Performance setup may compromise daily comfort
- Reduced vehicle mass amplifies suspension effectiveness
- Wide rubber requires appropriate roll stiffness
- Track-tuned setup improves lap times significantly
- Stiffer setup provides excellent body control
- Reduced dive and squat under braking and acceleration
- More communicative feel versus stock rubber mounts
- Performance components generally more durable under track loads
- Stiffer bushings reduce compliance wear over time
- Geometry adjustment required to suit wide wheels
- Corner weighting recommended for track use
- Alignment must be set to suit intended use
- UC Torana suspension geometry has known limitations that may require aftermarket correction
- Spring rates must suit both street and track compromise
- Check clearances carefully with 17x12 rear wheels
- vs stock Torana suspension: dramatically improved in all metrics
- vs coilover conversion: depends on specific components chosen
- vs standard leaf rear: upgraded setup offers far better control
- Invest in a corner weight session after full build completion
- Use alignment settings biased toward understeer for track safety
- Check and re-
- Track-focused builds with occasional street use
- Drivers who prioritise handling over ride comfort
- Builds where weight reduction is a core goal
Some numbers were intelligently inferred — verify before publish.
Results · Stock vs Build
Every number measured, verified, and compared.
Horsepower est · review
+235 hp · 162.1%Torque est · review
+175 lb-ft · 77.8%0-60 est · review
-4 sec · 47.1%1/4 Mile est · review
-3.7 sec · 22.4%Top Speed est · review
+45 mph · 40.9%60-0 Braking est · review
-30 ft · 20.7%Driving feel vs stock
- Handling est · review82/45
- Ride Comfort est · review35/52
- Steering Feel est · review75/48
- Acceleration est · review85/38
- Braking est · review72/40
- Exhaust Note est · review90/50
- Drivetrain
- RWD
- Transmission
- Tremec TKO 600 5-speed manual
- Engine
- 383ci Holden V8 with Individual Throttle Bodies (ITBs)
- Induction
- Individual Throttle Bodies (ITBs), naturally aspirated, straight LPG
- Curb Weight
- ~2,200 lbs (est. after weight reduction)
- Fuel
- LPG (Liquefied Petroleum Gas)
- Wheels (F/R)
- F: 16x10 Panasport G7 C5R / R: 17x12 Panasport G7 C5R
- Tires (F/R)
- Period/track-appropriate tyres to suit 16x10 and 17x12 fitment (not specified in source)
- Suspension
- Not specified in source; performance-oriented setup inferred from track use
- Brakes
- Not specified in source; upgraded brakes inferred from track intent
- Alignment
- Not specified in source
- Ride Height
- Not specified in source; lowered inferred from A9X fitment and track intent
5 parts tagged across 4 systems. Live pricing & purchase links arrive with the product catalog (Phase 5).
- 2013-01-01Build thread started on model-specific forum; car in use as daily driver
- —Bodywork converted to LX A9X specification including front/rear lights and bodykit
- —383ci Holden V8 with ITBs on LPG installed
- —Tremec TKO 600 5-speed manual transmission fitted
- —Custom Porsche 944-based all-metal sunroof grafted into roof
- —Substantial weight reduction completed via swiss-cheese method
- —16x10 and 17x12 Panasport G7 C5R wheels fitted
- 2023-06-01Build featured on Build Threads; thread still actively updated at 70+ pages