Part of the crankcase vent system...but I dunno any particulars

https://parts.jaguarlandroverclassic.../brand/jaguar/

Cheers
DD

 

Andy those are called the full load/part load breather tubes. The small pigtail fitting goes on the intake manifold stub (part load), and the larger fitting of the same hose goes to the main air intake.

I don't fully understand the design here but the idea is PCV. Although there is no PCV valve used. The hoses have restrictors in them. You probably need to transplant these pipes for your install.




I like what you did with the oil pipe feed/gauge feeds.

 

Excellent! Thanks to you two! (Also, I always forget to check the parts book)

I went digging through my parts and found the originals and reinstalled.

I’m a little uncertain how this setup isn’t a vacuum leak but will trust the original design since the Jaguar engineers are smarter than me.