Have a look through this.....
http://forums.justcommodores.com.au...fications-motor-vehicles-vicroads-2011-a.html
Also, this is an extract from
Here.....EPA Modified Vehicle Guidelines 2006
Engines
Vehicle engines are designed by the manufacturer of
the vehicle to meet stringent exhaust and evaporative
emission standards set out in the ADRs. Changing the
engine of a vehicle must not result in more pollution
being emitted than would be emitted by the original
engine when properly maintained.
The following engine replacement options are
available.
(a)
Replacement of an original engine with a new,
reconditioned or used engine of the same
general specification is permitted. This engine
must be designed to meet the original engine’s
emission standards. All emission control
devices and systems must be fitted. For
example, you can install a new, reconditioned or
secondhand Commodore VN 6-cylinder engine
into your VN Commodore.
(b)
Replacement of an original engine by an engine
that was offered as an option for that vehicle
make and model at the time of manufacture of
the vehicle is permitted. The replacement
engine must be of the same specification and in
its original configuration including all
emissions-related devices or systems. For
example, Ford provided several engine options
for the XE Falcon, so the 3.3 litre 6-cylinder
engine can be replaced by a larger V8 from the
same model range.
(c)
Replacement of an original spark ignition
engine by a diesel engine is permitted.
(d)
Replacement of an original engine with an
engine that was designed to meet more
stringent requirements
is permitted provided
that the replacement engine is in its original
configuration including all emissions-related
devices or systems. For example you can
replace the engine of your 1987 VL Holden
Commodore with an engine made in 1997 for a
VS Commodore.
(e)
Replacement of an original engine by any other
engine is permitted provided that:
i.
if the original engine was originally fitted
with emission control devices or systems,
then the replacement engine must be of
similar or later age and must be designed to
meet the same or more stringent emission
standards (plus the emission control devices
or systems applicable to that replacement
engine must be fitted and operate in the
correct manner)