Identification - Team Camaro Tech
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post #1 of 5 (permalink) Old Mar 31st, 08, 09:17 AM Thread Starter
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Join Date: May 2003
Location: Vacaville
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Exclamation Identification

I have a 67 with a 327 and a 2 speed powerglide. I have three questions that have been nagging me for some time.

#1- On the manifold is a "T" fitting that goes to the power booster and then has a metal tube that eventually is connected to a where don't know.
#2- As the tube disappears behind the engine and the firewall there is another hose that with a beige type of plug...following this down it is connected to the powerglide.

#3- Behind/under the distributor is a tapered fitting with a is connected to the pvc valve that runs along the passenger side of the valve cover.

If someone on the board could help me it will be greatly appreciated.

Thanks Ken
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post #2 of 5 (permalink) Old Mar 31st, 08, 10:36 AM
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Re: Identification

Without a picture, I will take a stab at what I think you are asking. 1.The T fitting-you said one side goes to the booster. This might indicate that it is a fairly large vacuum hose and the other side of the T could be for the PCV valve. The 327 I have stored has a plug in the intake hole that I think you are referring to but the car does not have power brakes. Mine has the PCV hose connected to the rear of the carb-2 barrel.
2. Mine is a manual transmission but the tube going to your transmission is for the vacuum control modulator, I am fairly sure that is the correct term. It also has a small metal line that is connected to the vacuum advance via rubber tube.
3. The only thing under and behind the distributer that I see is the oil pressure sending unit, a bolt hole in the manifold for the coil mounting bracket, and the distributer hold down bolt.
I don't know if this helped since I am trying to visualize your description and comparing it to my 327. If not, sorry.
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post #3 of 5 (permalink) Old Apr 2nd, 08, 11:44 AM Thread Starter
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Smile Re: Identification

Deerhunter...thanks. So I did some checking it is a "T" vacuum fitting on the intake manifold. One side goes to the Powerbrake booster, the other is connected to the vacuum modulator on the transmission case.

The other is pictured on UPC L30 A3 in the 67 Assembly Manual. It may be called a "breather tube" which connects to the PVC valve into the carburetor through two hoses.

I still have not identified a hose that runs from the tranny (right side/passenger) above the word "Powerglide" up the firewall to behind the distributor and has a breather style plug similar to the one pictured in Ricks catalog -12 bolt breathervalve rear-SS 152
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post #4 of 5 (permalink) Old Apr 2nd, 08, 03:43 PM
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Re: Identification

#3 is probably an early conversion of the old draft tube to a PCV system. Originally there was a pipe that went down the back of the block to a level about equal to the bottom of the oil pan that ended in an angle cut. The angle cut faced backwards and caused a low pressure zone at the end of the tube which sucked the combustion gases out of the interior of the engine. There is a small can attached to the other end of that tube in the back of the lifter valley that keeps you from sucking liquid oil out of the engine. when the cars were first switched over to a true closed PCV system all the engineers did was to hook a tube from the fitting at the top of the block to a vacuum port on the carb, or intake manifold to suck the fumes back into the engine to be burned. Later they hooked the vacuum line directly to the oil fill tube at the front of the block and the PCV valve screwed into the fill tube.

Mark Canning
1969 Indy Pace Car
350/300HP RPO Z11

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post #5 of 5 (permalink) Old Apr 7th, 08, 03:38 PM
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Re: Identification

It has been forever since I have dealt with a Powerglide but they very well could have had some sort of breather tube that went up high to keep it out of the road grime. Not positive though.
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