Re: 283 PCV question
>>the connection on the rear of the block has a hose that goes to PCV screwed into base of carb.<<
That part is good. Now you still need a provision for clean fresh air to enter the crankcase.
The drawing on post #10 shows a vented cap for air intake. That is period correct, but it is what they call an OPEN PCV System.
The single problem with that is that during WOT, when blow-by is at its maximum, vacuum is at its lowest and the PCV System can't pull much of the crankcase fumes into the intake manifold to be burned. The excess crankcase fumes spew out into your engine compartment from that vented cap.
It you use a closed vent cap with a side port and connect that to the air cleaner, it becomes a CLOSED PCV System and your engine should stay cleaner.
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'67 GMC 2500, 292, 4spd, AC
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