1963- 250 hp pvc?

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lib - 11 Dec 2005 05:20 GMT

Is it better to install a PVC than re-using the original oil breather system
that I now have? Are there any modifications that are necessary to do the
change-over? Thanx- lib

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WayneC - 11 Dec 2005 06:31 GMT

> Is it better to install a PVC than re-using the original oil breather system
> that I now have? Are there any modifications that are necessary to do the
> change-over? Thanx- lib

What you have now is essentially the same thing, I think... a hose from
a hole on the rear top of the block to a one-way valve at an elbow that
enters the rear base of the carb (crankcase ventilation). The oil
breather cap allows air to flow into the block, through it, and out the
rear hole. If you have a lot of blowby, I suppose crankcase vapors could
be forced out of the oil filler, but that means you've got a serious
need for an engine rebuild.

Is that what you have? I'm not sure why you'd want to change it. Other
years/models take the crankcase vapor from a grommeted hole in a valve
cover or a nipple on the oil filler tube. They accomplish the same
thing, SFAIK.

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lib - 11 Dec 2005 17:26 GMT

Is this "one-way valve " the equivalent of a PVC? We are doing an
engine+carb. rebuild and my mechanic was pondering the change-over if there
is an advantage. I am replacing the hose/grommet assmbly. for the breather
and it also shows a "PCV ADAPTER - ELBOW IN BACK OF CARBURETOR" but it
doesn't show an actual valve. It only shows PVC for F.I. engines , as I
read it. (Corvette Central online parts diagram /part #352033). Thanx- lib

>> Is it better to install a PVC than re-using the original oil breather
>> system that I now have? Are there any modifications that are necessary to
[quoted text clipped - 11 lines]
> cover or a nipple on the oil filler tube. They accomplish the same thing,
> SFAIK.

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WayneC - 12 Dec 2005 01:21 GMT

> Is this "one-way valve " the equivalent of a PVC? We are doing an
> engine+carb. rebuild and my mechanic was pondering the change-over if there
> is an advantage. I am replacing the hose/grommet assmbly. for the breather
> and it also shows a "PCV ADAPTER - ELBOW IN BACK OF CARBURETOR" but it
> doesn't show an actual valve. It only shows PVC for F.I. engines , as I
> read it. (Corvette Central online parts diagram /part #352033). Thanx- lib

Check the diagram in the upper right corner of this document page:
http://www.licorvette.com/pdfcatalogfiles/cat23/22.pdf

>>>Is it better to install a PVC than re-using the original oil breather
>>>system that I now have? Are there any modifications that are necessary to
[quoted text clipped - 12 lines]
>>cover or a nipple on the oil filler tube. They accomplish the same thing,
>>SFAIK.

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lib - 12 Dec 2005 15:35 GMT

After further review, I am going to stick with the original system. Thanx
for the info-lib

> Is this "one-way valve " the equivalent of a PVC? We are doing an
> engine+carb. rebuild and my mechanic was pondering the change-over if
[quoted text clipped - 19 lines]
>> cover or a nipple on the oil filler tube. They accomplish the same thing,
>> SFAIK.

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