Author Topic: Crank case vent tube  (Read 262 times)

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Offline preaction

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Crank case vent tube
« on: March 16, 2019, 12:18:13 pm »
The 67 engine assembly manual calls this  a  "Tube assembly-crankcase ventilation"  I knew there were two different angles to the stub from the parts shown but im not exactly sure as to why I thought the higher angle part is for the CJ.
68.5 Mustang black 4sp 3:50    67 Cougar 6.5 Liter

Offline sportyworty

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Re: Crank case vent tube
« Reply #1 on: March 16, 2019, 01:34:29 pm »
Paul there is a 3rd one the PI. The 390 is most upright then CJ and last PI. It is due to the shape of the intake runners and clearance.
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Re: Crank case vent tube
« Reply #2 on: March 16, 2019, 06:25:13 pm »
Thanks Kerry ;) I thought the two I hade were 390 and 428 but wasn't sure as to which was which. Being a low riser would a GTE have used the CJ part ?
68.5 Mustang black 4sp 3:50    67 Cougar 6.5 Liter

Offline Chris Teeling

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Re: Crank case vent tube
« Reply #3 on: March 16, 2019, 09:10:10 pm »
My experience is that the one on the left in Kerry's picture is the CJ.
1968 1/2 Fastback
1988 LX 5.0 Hatchback

Online RoyceP

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Re: Crank case vent tube
« Reply #4 on: March 17, 2019, 10:14:43 am »
If it is a 428 Cobra Jet GT-E then yes.

The 427 GT-E uses low riser heads like the Cobra Jet, and the aluminum C7AE-F intake, so it has the same PCV tube as the 1967 Fairlane / Comet W code engine which is a 427 Medium Riser. The 1967 - early 1968 428PI engines and the 428 GT500 Shelby also use this same tube.


Thanks Kerry ;) I thought the two I hade were 390 and 428 but wasn't sure as to which was which. Being a low riser would a GTE have used the CJ part ?
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1968 Mercury Cougar XR-7 GT-E Green 427 W Code
1968 Mercury Cougar XR-7 428CJ R code 3.91 C6

Offline sportyworty

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Re: Crank case vent tube
« Reply #5 on: March 17, 2019, 11:48:26 am »
Chris is right under my pic says: PCV CJ 68 390 and reg 390428 passenger.jpg
I grabbed the wrong pic. It was my reference the CJ next to the 68 390 S intake tube when I noticed the non S 390 intake  tube stood up even more. Like Royce shares the 427 GTE/ GT500 PI tube is same. Besides having the most layed over hose end also has a couple of other different bends and is really quite different than the others. They are really scarce as well.

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Offline sportyworty

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Re: Crank case vent tube
« Reply #6 on: March 17, 2019, 02:56:58 pm »
First pic is a PI tube for context and to illustrate the angles mentioned. So there were 4 different tubes at that time of mfg
Second pic is a complete original 68.5 PCV system. The parts came from a long block assembly with following dates:
Block casting 8C30
Assembled 8D10
Heads 8C8 8C12
Intake 8D3
Balancer C8
Timing Cover March 3 dot
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Offline Chris Teeling

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Re: Crank case vent tube
« Reply #7 on: March 17, 2019, 04:40:07 pm »
It's interesting that the power booster tube is the angled kind rather than the flat type.

Is that because it was in a Fairlane?
1968 1/2 Fastback
1988 LX 5.0 Hatchback

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Re: Crank case vent tube
« Reply #8 on: March 17, 2019, 08:50:04 pm »
Great info thanks for posting the pics.
68.5 Mustang black 4sp 3:50    67 Cougar 6.5 Liter

Offline Jiffy

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Re: Crank case vent tube
« Reply #9 on: March 20, 2019, 12:15:34 am »
yes - great pic Kerry. I have been burned by various parts suppliers when ordering stuff in the past, and the CJ PCV tube was one, advertised as a 428CJ but the sent an early 390 tube - in a packet with the CJ label - instead, then blamed the vendor for packaging the wrong one.