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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


To a certain extent, but it depends on which eye in relation to the breather location. Squeezed butt cheeks are dependent upon ET. Coupled with the drop in rpm's from the gear change, the combined modial interaction of magneto reluctance and capacitive diractence within the ignition system will cancel the 6th order harmonic oscillation, enabling the spurving bearings to remain in a perpendicular centerline with the driveshaft. Thus, side fumbling of the spurving bearings is effectively eliminated.

..... Ok You win...... I think you broke my spell check