Originally Posted by tclederman
Jerry,

On some USA truck 261s I have seen illustrations of the PCV tube/line being routed from the valve cover into the carburetor air cleaner.


That is the fresh air inlet to the crankcase making it a closed system. If it didn't have that it would need a breather type oil fill cap, making it an open PCV system.

BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022