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4 Valve/cyl In R Model. From What Year?


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Hi Guys,

I am not a pro when it comes to Mack. I will like to know what year did Mack start installing 4 valve / cylinder engines in the R models.

Any physical attribute to know a 4 valve engine from a 2 valve engine?

Also, what year did the electronic fuel management began on these engines?

Thanks a lot.

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Aluminum valve covers tell u that its a 4 valve head. I THINK 84 was the first year of the 4 valve heads. As for electronic fuel pump? I think it was about 93 or 94.

If I remember correctly the fuel injectors installed from the side on an E6 four valve head also.


Dog.jpg.487f03da076af0150d2376dbd16843ed.jpgPlodding along with no job nor practical application for my existence, but still trying to fix what's broke.



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