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Are there any adverse effects to running a breather on one valve cover and not the other?


Absolutely! The side of the engine with the breather will be heavier, thus causing the engine to go out of balance and create 6th order harmonics throughout the driveline, resulting in pre-mature wear of the deltoid spurving bearings, which are encapsulated by the differential girdle caps.
So, the bottom line is, you need a breather on both valve covers.

Yeah, but you can compensate for that by closing one eye and squeezing your butt cheeks together on the shifts