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Old 03-25-2012, 07:34 PM   #1
reel vinyl
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Default 1968 corvette 327 l79

hi was wondering if someone could show me a photo of the the crank case vent on the 327 l79 motor i dont know what to look for
the valve covers can be changed and the manifold can be changed
but the sure way to know a 327 is that crank case vent

thanks
Rod
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Old 03-25-2012, 08:59 PM   #2
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Sorry, mine does not have the stock covers or manifold, and my spare engine and the original are disassembled.
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Old 03-25-2012, 09:20 PM   #3
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If I remember correctly, the SB '68 had a breather tube sticking up from the front of the intake manifold area with a breather cap on it. That was the only C3 year to have that design.
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Old 03-25-2012, 09:41 PM   #4
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If I remember correctly, the SB '68 had a breather tube sticking up from the front of the intake manifold area with a breather cap on it. That was the only C3 year to have that design.
I think you are thinking of the oil fill neck on the 327.
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Old 03-26-2012, 07:52 AM   #5
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I believe 7T1 is correct
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Old 03-26-2012, 10:48 AM   #6
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Here's what you're looking for. The tube at the front mentioned above serves as the oil filler tube and the inlet for the PCV system I believe.

http://www.fossilcars.com/chevrolet-...-intake/175016

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Old 03-26-2012, 12:16 PM   #7
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The tube in the front is only for oil fill, on the 327's only. Older C-2's had a tube on the side of the oil fill tube for the pcv hose. The original 68 L-79 only chrome valve covers each had one hole in them. The left hand side was for the pcv valve and hose and the right hand side was for a metal tube and hose up to the air cleaner base spark arrester.
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Old 03-26-2012, 01:08 PM   #8
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My recollection was incorrect. That tube is just for oil fill and had a sealed fill cap on it. Thanks for the correction.

[I'm told that "memory" is the second thing to go, as we grow older; but, I can't remember the first... ]
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Old 03-26-2012, 05:27 PM   #9
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For the 68 327s, the PCV valve is in the left valve cover and connects by hose to the base of the carburetor. AIM shows it. 68 327s have no road draft tube like earlier small blocks had.

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Old 03-26-2012, 05:44 PM   #10
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hey you guys have all been great 7t1 vette youre hillarious!!! but Tom Falconer collectors guide says page 18 "valve covers and intake manifolds could be changed but there is no question about that rear block vent" so my question to you friendly fellas is where is it??
and what is it ?? he calls it a crank case vent at the back of the block just beside the
distributer
thanks Rod
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Old 03-26-2012, 07:17 PM   #11
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Someone with a copy of the '68 AIM would have to assist on this one, I think.
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Old 03-26-2012, 08:49 PM   #12
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Quote:
Originally Posted by 7T1vette View Post
...Someone with a copy of the '68 AIM would have to assist on this one, I think...


I re-read that section in Mr. Falconer's book and I am wondering whether he might be mistaken.

The plug looks like a small freeze plug. I have seen them, but only on older small blocks. It is on the pad on the block to the left of the distributor and very close to the oil pressure line fitting if it is there.

If memory serves, my original 327/300 assembled in April, 1968 does not have the plug.

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Old 03-26-2012, 09:15 PM   #13
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Quote:
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[IMG]

I re-read that section in Mr. Falconer's book and I am wondering whether he might be mistaken.

The plug looks like a small freeze plug. I have seen them, but only on older small blocks. It is on the pad on the block to the left of the distributor and very close to the oil pressure line fitting if it is there.

If memory serves, my original 327/300 assembled in April, 1968 does not have the plug.

Here's a bare block with the hole Mike is referencing.



In earlier years (pre-PCV) a road draft tube was installed as crude method of venting crankcase vapours. That's what caused the filthy black strip down the center of many 50s and 60s highways.
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Old 03-26-2012, 09:35 PM   #14
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thanks for the info guys as i became a little nervous after reading Mr Falconers guide but with all due respect to him i took it as bible perfect and no one is perfect... so with that in mind i thought maybe i coudlve had a fake 327 even though the block #s match the vin in the window if you guys go to my profile you can see a pic of my motor
kind regards and many thanks
Rod
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Old 03-26-2012, 09:37 PM   #15
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...three pics from the very original 42,000mi Silver '68 L-79 4spd car I used to own.

Last edited by Paul Borowski; 03-26-2012 at 09:41 PM.
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Old 03-26-2012, 09:41 PM   #16
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thanks Paul looks the same as mine minus ignition shielding ...take a peek at my motor on my pics if you get a chance let me know your thoughts....
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Old 03-26-2012, 09:46 PM   #17
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Quote:
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so with that in mind i thought maybe i coudlve had a fake 327 even though the block #s match the vin in the window if you guys go to my profile you can see a pic of my motor
kind regards and many thanks
Rod
Why not tell us the casting numbers, dates and stamp pad info if that's what you're really asking.
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Old 03-26-2012, 09:54 PM   #18
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sure id be happy to do that its getting some minor mechanical right now though...would the vin # help for now???? i can submit the casting #s wednesday or thursday...i know also it has an HT on the block as well
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Old 03-26-2012, 09:56 PM   #19
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Quote:
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thanks Paul looks the same as mine minus ignition shielding ...take a peek at my motor on my pics if you get a chance let me know your thoughts....
....your set up looks correct, minus the smog set-up.
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Old 03-26-2012, 10:08 PM   #20
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thanks Paul ......whats smog set up?
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