Never Too Late Chevrolet/NCRS

[John H.]

Re: Never Too Late Chevrolet/NCRS

It might also be noted that the '63 crankcase ventilation system was the first year for the "closed positive" system, and was a one-year-only design that flowed "backwards". Clean air from the air cleaner was connected via a small tube to the oil fill tube as the "intake" side, and the "exhaust" side had an adapter in the vent hole in the rear of the block with a tube to a PCV valve in the rear of the carb baseplate.

The system was redesigned for '64, with the flow reversed - the "intake" side became the vent hole in the rear of the block, connected to the air cleaner by a large-diameter adapter tube, and the "exhaust" side became the oil fill tube, connected via a hose to the carb baseplate either by a restrictor fitting or a PCV valve. That basic system became the standard until the vent hole in the back of the block disappeared and the "intake" and the "exhaust" became holes in the valve covers.

[Stuart F.]

Re: Never Too Late Chevrolet/NCRS

John;

Thanks for the reply and your earlier comments on the subject. Yes, the 63 is the odd ball. But they learned from it I'm sure. One need only look at the later fresh air connections to the air cleaners on V8 engines where they use a separate little "hog Hair" type element Outside the air filter cartridge itself. Many fellows with earlier Vettes thinking (as I have) about putting in a later year engine in their cars have to confront this issue, specially if they want to maintain the appearance of stock. I have pretty well deceided, at my age, to leave it alone and let my heirs figure out what to do with it.