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Old 08-31-2006, 05:18 AM
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vacuum set up

I am confused ! Everyone tells me something different. Is it possible to get a link to any info, pics, diagrams etc on the vaccum set up for my 350 engine. What pipes go where, to and from the inlelt manifold, carb, TH350, rocker covers etc ?

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Old 09-01-2006, 09:20 PM
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There are about a zillion different possibilities, so no wonder you can't get a single answer. Vacuum diagrams were provided under the hood of most GM cars since 1968 or so, because different models had different emission-control systems, and different areas (California, federal, export, etc.) also had different requirements. Do you have any idea what year the engine is, what car it came in, etc.?
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Old 09-01-2006, 11:49 PM
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vacuum set up

Hi Thanks for your reply. The car is a very simple 1937 steel body Morris 8. There is no emission control system, power steering, air con etc. All I have is a pipe from each rocker cover going to the air filter which some say should have PCB valves? something about unburnt gases or oil going back into the engine and out the exhaust and not through the air filter? A pipe to the brake servo and one to the TH350, both from the Holley 600. There may be a couple of others I will try and post pics. Engine is brand new Goodwrench 4 bolt with Comp Cam 268 making around 300 break / 365 ft lbs.
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Old 09-04-2006, 07:14 AM
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My '75 GMC truck with GMPP 350 and Heavy Duty emissions has one of the simplest vacuum setups, but it should work well for your application.

- There is a fitting on the back of my Edelbrock 1406, and it has a large diameter (3/8"?) metal pipe connected to it, which is where the hose to the power brakes connects.

- On the intake manifold, rear passenger side, is another vacuum fitting. The rubber hose from this fitting has a T in it. One side goes to the heater/AC vacuum reservoir, and the other connects to the TH350 transmission vacuum. The transmission line has a short piece of rubber, then a large U-shaped piece of metal line that leads down next to the engine, and then another section of rubber to connect to the transmission. The metal section protects the line as it goes past the exhaust manifold.

- From the base of the carburetor, a vacuum line connects to the HEI vacuum advance. You can use either ported vacuum or manifold vacuum (there are two ports on the Edelbrock). For your application, manifold vacuum would probably be the simplest choice - just make sure you disconnect it when you time the engine.

- In the driver's side valve cover there is a PCV valve, and the hose from the PCV connects to the PCV port on the front of the Edelbrock 1406.

- In the passenger side valve cover there is a push-in hose connector, with the hose connected to the air cleaner base. This could be replaced with a push-in breather cap, since it just pulls in fresh air.

Also make sure you have a vented gas tank cap, or have connected the vent lines to the tank.

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