Remember: Japanese cars uses milimetric measurements, so the factory size for the main PCV system's Hoses, is the milimetric equivalent to 19/32" (~ 15.1 mm) I used 5/8" in evaporative systems' rated Hose, 5/8" = 20/32" (~ 15.8 mm) with perfect results.
5/8" is easier to find than 19/32" and gives more room for the fumes to move freely.
So, I'll refer to all the hoses in inches only.
To do the proper reinstall, I needed:
1. Enough 5/8" Hose (more than 4 foot needed).
2. Enough 3/8" Hose (Less than 1 foot needed).
3. One Lightweight Plastic 5/8" Tee with a 3/8" detour opening.
(the 3/8" detour is very important, do Not use an equal diameter tee)
4. One 5/8" Lightweight Plastic Elbow to Use at the Air Filter Box,
(instead this Heavyweighted brass one I did before)
I obtained an Aluminium Elbow for the P.C.V. Valve:
(it is Not necessary, could be Directly Connected, but I Like it)
5. Add a New 3/8" Opening, welding a Plug with Brass, to the Air Filter Box Base.
I took a Photo of it, to show you the two openings, which are intended for:
► The one on the Left was added by me; is for the "Pressure Relief" detour.
....(This will be explained below)
► The one on the Right, is the straight 5/8" opening, which goes to the above
....described Elbow. (Also this will be explained below. Keep Reading)
6. Enough Clamps, for each Hose's end.
7. New intake Manifold's Gaskets and Bolts.
8. Rubber caps for closing the unused vacuum ports at the intake manifold.
I Reinstalled the intake Manifold using the Original Subaru Gaskets.
Prior to Install them, I Smeared both sides with a Light Coat of Ultra Cooper Silicone:
Forget About Crappy Aftermarket gaskets and you'll Avoid Future Problems.
Also I changed the Worn-out Old Screws that held the intake manifold in place,
with Newer ones (Found at the Local NAPA), which are Steel reinforced and Rust proof,
which are 8 mm X 80 mm X 1.25 Pitch:
In my Case I added an (optional) Oil Catch Can.
As I wrote in previous posts, and in other threads:
My White Wagon isn't White Anymore. I Painted it in Yellow Colour as I explained here, Lighter tone than my Other Yellow Wagon (the Dead 2.7), but this one has Black Stripes, and many mods...
Now you will See how all this Stuff ends Together...
► P.C.V. Hoses Goes as Follow:
(Remember: these explanations are referenced for the LHD models)
First - The Driver's (right) Side Head Opening, goes to the P.C.V. Valve at the intake Manifold, use enough 5/8" Hose, but you must place the "T" with the 3/8" detour for the "Pressure Relief" inbetween, then place enough 3/8" Hose, directly from said "T" detour, to the added 3/8" Opening on the Air Filter's Box base.
(In my case, the Oil Catch Can is in that same 5/8" hose Route as well, if you don't need one, use a Direct Hose)
Last - The Passenger's (left) Side Head 5/8" Hose goes directly to the Air Filter Box.
► Vacuum Lines Goes as Follows:
- Use a Vacuum Hose, from the Front of the Weber's Right Port, to the Advance on the Distributor. (this is a Progressive Vacuum Port)
- Use the Proper Vacuum Hose, from the intake manifold, to the Brake Booster.
- Use another Vacuum Hose, from the intake Manifold, to the A/C vacuum accumulator Bottle.
► The accumulator bottle under the Windshield, at the engine bay, behind the Passenger's side strut Tower (on LHD Models) is used to provide stable vacuum for the A/C buttons on the Dashboard and also for engaging the 4WD mode on the models equiped with Push-Button transmission. So, if your subie doesn't have that kind of Transmission nor A/C, you can simply omit to connect that third vacuum line.
► The E.G.R. System: Is it necessary? ... Well, the answer will depend on your area's Laws against pollution and what will be needed to stay in the car in order to pass emmissions; but that E.G.R. design is unhealthy for the EA82, that is the reason why the Subaru Engineers removed it from the third gen Heads.
But if you want to keep it and make it work as close as it should, the front of the weber carburetor has two pipes that provides vacuum, the one on the Right side which is Progressive, is intended for the distributor's advance; while the pipe on the Left side, provides vacuum until the engine is at higher RPM's, when the Secondary (high) stage of the carburetor is activated; so it is intended to be hooked at the E.G.R. Valve.
So, you can run a fourth vacuum line directly from said front-left port on the Weber Carburetor, to the EGR Valve at the intake manifold, to make the E.G.R. system, operative.
► The A.S.V. System needs to be Removed, so the rest of the Openings on the Exhaust, shall be Closed, otherwise your engine bay will become Noisy from exhaust...
► Don't forget to cap Close all the unused ports at the intake manifold!