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Well, in the specific case of that car, because it is a DET Neo, the bloody great traction control motor & throttle on the crossover pipe is the main giveaway.

In general;

The plenums are different shapes. Neo is more "square". Little detail differences like location of coolant bleeders, type of IACV, etc.

There's an ECU boost sensor on the top/rear of the motor on Neos.

Injectors are top feed.

Turbos have OP6 housings, but of course this is easily changed.

The ECU is a bloody big giveaway if it is still in the car too. Part numbers don't really lie.

Edited by GTSBoy

In this scenario it's clearly a Neo. I would love to see how this is done in a scenario where all you get is the block and head bolted together with no peripherals at all which is obviously a bit of a bigger concern when buying a 2nd hand motor...

i can help you identify by seeing a picture :) but a very easy way is that the neo's timing belt cover is plastic. people often say if the CAS is plastic its a neo BUT its not true because very late model series 2  and the ultra rare series 3's  cam with plastic CAS hitachi ones too 

23 hours ago, GTSBoy said:

Neos are solid lifter. Injectors are top feed. IACV is different, etc.

I get this, but what if you only have the motor? I.e there is no IACV, no manifolds, no coilpacks, no coilpack cover, and you can't pull a rocker cover off to confirm (i.e buying online or something).

I do not have a RB anymore but I always was curious about this, if the timing cover is plastic on a Neo, is it metal on a RB25 from a R33 then?

17 minutes ago, Kinkstaah said:

I get this, but what if you only have the motor? I.e there is no IACV, no manifolds, no coilpacks, no coilpack cover, and you can't pull a rocker cover off to confirm (i.e buying online or something).

I do not have a RB anymore but I always was curious about this, if the timing cover is plastic on a Neo, is it metal on a RB25 from a R33 then?

Neo doesn't have the front head oil return from vct and vct solenoid is different.

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