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Hi Rovers,
I have just bought a re-built long bare 4.0L engine (expanded to a beefed up 4.6L) from Triumph Rover spares in South Australia. They also provided a 14CUX efi from a 3.9L engine which I am re-conditioning. Of course, I don't want to put a "3.9" stamped plenum on a 4.6. I was wondering if the 3.9 and 4.6 plenums are interchangeable, then started wondering, if they are different sizes, is the 3.9 efi hardware suitable for the new, larger capacity engine?


The new donk is going into a TR7 I am developing as a fast street/weekend track car.


Best regards,


Michael
 

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THey are all interchangeable except for large intake Special Vehicle models and customs such as Calaway.
 
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