What mack engine is this?

[MADDOG83]

Hi guys new to forum, not being any thing of a mack expert I was wondering if anyone can identify the engine in this Australian built R600, 

From my research so far I believe it's built approximately 1970-1971. Please feel free to correct me on anything but I put it in this build time because 

-early grease hubs

-narrow cab

-early roof clearance lights

-Flintstone dash

-small grab handles

-square tanks

obviously not all these are easy visible but I have many photos of this particular truck.

Those with a keen eye will notice it's the truck from MM2 and yes twin cleaners and it isn't a cool power.

From looking at it I personally believe it to be a END673 or ENDT673 but why it has twin air cleaners is beyond me. I know a guys who worked at the Kenworth dealership where this truck was purchased from by George Miller and MM2 production crew as when traded although red in colour (you can see traces of its original colour in the photo) it also had the twin cleaners. 

Many info you guys can give me would be greatly appreciated. This photo was a behind the scenes phot on location. They used two trucks in filming but predominantly this one and I know the second truck (originally green in colour) didn't have twin cleaners or exhausts and was mocked up that was by the arts department. This is a rare photo of both trucks together with the hero truck on the rights and double on the left. 

Cheers 

Edited June 7, 2016 by MADDOG83

[j hancock]

I think you are on the right track with the engine id.  A picture of the right side of the engine would be helpful but may not exist.  I would say the dual air cleaner was added for theatrical flair. 

[Vladislav]

From looking the engine compartment shot I'd say the double cleaners were just connected to the turbo intake by the T-pipe.

The engine looks like ENDT-673 or 707 to me. I'm not the great expert on both them though.