other than screwing with a '61 850 that I don't like the sound of...
You should probably install a PCV and let the engine breathe into the manifold, otherwise the below applies to the breather tube in the air cleaner
Quote:
1/ Should I use the A+ rocker cover with breather in oil cap or 850 cover with pipe?
2/ What to do with breather that bolts onto gearbox clutch housing?
3/ Should I run the 850 timing case without breather???
1/ use the A+ rocker cover
2/ run it to a T piece with the breather on the A+ timing case and into the air cleaner or PCV
3/ definitely not... the A+ engine has a tensioner under there (I think), and the 850 cover won't have enough clearance for the double row timing chain
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