Read
this link.
It is the engine modification section of the national legislation for light vehicle construction and modification.
Section 1.1
Quote:
MODIFICATIONS NOT REQUIRING CERTIFICATION
• Fitting a replacement new, used or reconditioned engine.
• Fitting a manufacturer’s optional engine for that same model vehicle.
• Fitting replacement original equipment (or equivalent) engine & exhaust components.
In all of the above cases, if the engine is modified, it must be certified under the relevant Approval Code.
Section 1.2
Quote:
MODIFICATIONS REQUIRING CERTIFICATION UNDER LA APPROVAL CODES
• Fitting equivalent engines (within 20% of original power and engine weight).
• Fitting performance engines.
• Modifying engines and engine components.
I'm assuming from the D16A8 you want to replace it's in an EG civic or crx? So in relations to your average pre-95 Honda engine swap, the only engines not requireing certification are replacement engines of the same type or manufacturer optioned engines, i.e. another D-series engine. EG6's (and EF8, EF9, etc.) were never released in Australia so technically you aren't even meant to have an un-plated B16 in a pre-95 Honda as they should be coded as a LA1 modification (equivalent engine within 20% of original power and weight).
Civic's never came out with either a B18C or a B20. And both of these engines are over 20% of the power output of a D16. So they are classified as performance engines under the legislation and require certification and a LA2 coded mod plate (same thing on the blue slip or whatever you guys call it down there).
Yes, your average cop may pass over an engine swap and not realise it didn't come like that from factory. But get an asshole, sent to the pits or pulled over by a department of transport inspector and it won't end well. And with the way that you P-platers are targetted these days it isn't worth the risk imo. Remember, it isn't illegal do do the engine swap. It's illegal for a P-plater to drive a LA plated car.