Direct answer
An engine swap, a change of engine family, added forced induction, or a driveline change that alters how the vehicle is described on the register is a certified modification under VSB 14 unless your state agency and a recognised signatory tell you it sits in a without-certification bucket. Like-for-like replacement of a worn engine with the same identification is a different job. If you cannot tell which one you are doing, you are in the certified bucket.
We do not print a kilowatt figure at which a swap “becomes illegal”. Identity, emissions, cooling, fuel, brakes and restraints decide the job — not a forum horsepower guess.
Identity first
Registration records an engine number and a description. The VSB 14 introduction uses a change of engine number as the example of a description change that requires contact with the registration authority even when other work might have been minor. Tell the agency what will be stamped on the block before you crane it in.
Imported second-hand engines add identity and biosecurity paperwork that is outside this guide. Ask the agency how they want that engine identified.
Emissions and the rest of the certified engine
A later or different engine can carry different ADR emissions equipment. The swap is not finished when it runs. The finished vehicle still has to satisfy the emissions, noise and safety outcomes that apply to the build pathway the signatory is using. Deleting a catalyst or a filter to make a swap fit is two offences stacked.
Forced induction on a vehicle certified naturally aspirated is a powertrain change, not a bolt-on personality. Manifolds, fuel, cooling and engine management become part of the certified scope. Read this next to exhaust and noise.
Driveline, brakes and tyres
More torque asks more of clutches, differentials, shafts, brakes and tyres. VSB 14 keeps those systems in their own sections so a signatory can say when the original package is still suitable. We will not invent the crossover figure. If the signatory wants a brake assessment, that is part of the job, not an upsell.
Electrical and hybrid systems
Victoria’s approved-modification list excludes modifications that affect hybrid drive systems and high-voltage electrical systems from the simple approved bucket. Treat any high-voltage or hybrid-adjacent change as a specialist certified job. Do not apply a petrol-swap mental model to a high-voltage vehicle.
How to brief a signatory
Send the VIN, date of manufacture, current engine code, intended engine code, intended induction, intended exhaust path, and the state of registration. Ask which VSB 14 engine section they will use and whether the registry will require a description change on the same form. Do not start fabrication on a verbal “should be fine”.
Keep the certificate, the plate photograph, the engine identity documents and the invoice together. A later buyer will ask. An insurer may ask. A defect inspector will ask.
Related pages
Check with your state regulator or a recognised engineer before you change an engine or add forced induction. This guide does not certify a swap.
A swap diary that a registry can read
Page one: identity — VIN, current engine number, intended engine number, date of manufacture, state. Page two: emissions — which devices the donor and the recipient were certified with, and which will remain in the finished path. Page three: systems the signatory asked to assess — brakes, cooling, fuel, electrical, exhaust, mounts. Page four: photographs before, during and after, plus the certificate and plate.
If you cannot fill page two, you are not ready to crane a motor. If you cannot fill page one, you are not ready to talk to the registry.
Second-hand and imported assemblies
A used engine is still an identity event. Ask how the agency wants it recorded. Imported assemblies can add biosecurity and import-approval paperwork that this guide will not fake a checklist for. Use the Commonwealth import and biosecurity pages, then the registry.
Tunes, overlays and the software half
A software change that raises torque or disables a monitoring circuit is a powertrain modification even if every bracket looks original. Treat it as in scope for the same signatory conversation. We will not invent a kilowatt delta at which software “counts”. If it changes the certified behaviour, it counts.
Related
Performance, exhaust and noise, getting engineer sign-off. Check with your state regulator or engineer before you change an engine.
Mounts, crossmembers and the structure you did not mean to change
An engine that only fits after a crossmember is cut is a body and chassis conversation as well as a powertrain conversation. Write the cut into the scope. VSB 14 has body and chassis sections for a reason. A signatory who only stamps “engine” while a rail has been notched is not finishing the job you actually did.
Cooling, fuel and fire walls
Fuel lines that now sit nearer a turbo, and coolers that now sit in a crash zone the original design did not use, are safety questions. They may or may not be their own code. They are always in the photographs you should send before fabrication. If the signatory wants a different routing, that is cheaper in email than in tube.
Check with your state regulator or engineer before you change an engine or add forced induction.
Gearboxes, diffs and the rest of the line
A stronger engine on a weaker gearbox is a reliability story and sometimes a safety story if a failure locks a wheel. Signatories who assess powertrain changes often want the line described. Write the intended gearbox and diff. If you are keeping the originals, say so. If you are not, you may have opened another section.
Identification plates and restamping
Do not restamp an engine number as a shortcut. Identity fraud is a different legal problem from a modification code. If the donor engine’s number is the number that should appear, that is what the registry should see, through the process they publish.
Hybrid and electric caution, again
High-voltage systems are not a weekend swap community in the way a petrol six used to be. Victoria’s approved list puts hybrid and high-voltage work outside the simple bucket. Treat that as a national warning even if your state page is quieter: get a specialist signatory or do not do the job.
Related: performance. Check with your state regulator or a recognised engineer before you change an engine, a gearbox or an induction system. This guide does not certify a swap.
A week-by-week shape that is not a workshop manual
Week one is identity and emissions on paper — VIN, numbers, devices that must remain. Week two is the signatory email and the answer to “which section”. Week three is parts that match that section, not parts that look right in a photo. Week four is fabrication only after the scope is written. Week five is the plate, the photographs, and the registry description change if one is required.
If a week is skipped, the missing week is usually week two. That is the week that saves the others.
Write mounts, cooling, fuel and brakes into the same scope. A swap that only “drops in” on social media often cuts a member or moves a line in real life. Those cuts are the job.
If the donor is used, treat identity as a first-class problem. If the donor is imported, add the Commonwealth import and biosecurity questions before the registry questions. If the vehicle is hybrid or high-voltage, stop and find a specialist or do not start.
Check with your state regulator or a recognised engineer before you change an engine, gearbox or induction system. This guide does not certify a swap and does not invent a kilowatt limit.
Why a dyno sheet is not a certificate
A dyno sheet describes output on a day. A VSB 14 certificate describes a scoped modification against a code. You can have the first without the second, and you can have the second without publishing a figure. This site will not ask you for a number and will not print one. If a seller uses a dyno number as a substitute for a section name, you are still in a catalogue, not in a compliance pathway.
Put the dyno sheet in the pack if you have one — as colour, not as proof. Proof is the section, the signatory, the plate and the registry description.
Check with your state regulator or a recognised engineer before you change an engine. Identity, emissions, mounts, cooling, fuel and brakes are the scope. Kilowatts are not the headline.
One more identity check
The number on the block, the number on the certificate, and the number the registry will store must be a planned match. If they diverge, you do not have a finished swap — you have a description problem. Check with your state regulator or engineer before you crane a motor, and again before you present the car.