 dcairns
"4th Year" Silver Supporting Member
Posts: 1530
Loc: Orange CA
Reg: 11-07-03
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07-23-12 10:18 AM - Post#2251198
In response to Allan In NE
Yeah, I agree with Allan. It looks like the engine only has a breather, no suction side, which would explain occasional smoke out the breather. As I recall all 350 blocks did not have the cast in the block vent passage back by the distributer. When the 350 came out, they had switched to doing the vent/PCV system through the valve covers.
What you need is a hole in the other valve cover and a PCV valve and tube going to the carburetor (like my picture of the messy 350).
Old style block (as would be used in 64). Notice the extra hole next to the distributer hole (on the left side). The hole connects to the lifter valley. This extra hole is where the draft tube (in earlier years) would connect. By 64, there were the two vent systems, as in the diagram I posted earlier.
Later blocks the vent hole was filled in.
And then finally eliminated altogether, this is probably what your block looks like.
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drtyler (4)
