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By junkyardjeff - 16 Years Ago
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The original 272 had the vent with the filter but I have seen later Y blocks that do not have that so how does the ventalation systems work on the later motors and what different parts do they have compared to the earlier motors,I will most likely adapt a PCV system when I put a 292 back in. Now can I still put on the earlier vent on a later motor for the look of originality only.
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By oldcarmark - 16 Years Ago
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There are several previous posts on this topic.What you need to get hold of is a valley cover from a T-Bird y-Block.They had the roadraft tube hole at the rear of the cover and the tube ran down the back of the motor.That hole will accept a rubber grommet to hold a PCV valve.From there you plumb a hose into A) the carb if it has a fitting or B)the intake manifold as close to the centre as possible.Do not plug into the rear where there is a vacuum outlet because you may cause a lean fuel mixture in the rear cylinders.Use a I believe 1 1/4 inch cup type plug to fill the hole in the block where the roadraft tube bolts on.Bolt the tube back on if you want the appearance.Make sure your oil breather cap is clean so air can enter or create a closed system by using a cap with a fitting to run a hose to the aircleaner.Search previous posts for more info.I did my 56 awhile ago and it works very well.No more puffs of smoke from under the motor at idle and my garage no longer smells of fumes after parking the car overnite.Hope this helps a little.
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By 46yblock - 16 Years Ago
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oldcarmark (7/4/2009)
There are several previous posts on this topic.What you need to get hold of is a valley cover from a T-Bird y-Block.They had the roadraft tube hole at the rear of the cover and the tube ran down the back of the motor.That hole will accept a rubber grommet to hold a PCV valve.From there you plumb a hose into A) the carb if it has a fitting or B)the intake manifold as close to the centre as possible.Do not plug into the rear where there is a vacuum outlet because you may cause a lean fuel mixture in the rear cylinders.Use a I believe 1 1/4 inch cup type plug to fill the hole in the block where the roadraft tube bolts on.Bolt the tube back on if you want the appearance.Make sure your oil breather cap is clean so air can enter or create a closed system by using a cap with a fitting to run a hose to the aircleaner.Search previous posts for more info.I did my 56 awhile ago and it works very well.No more puffs of smoke from under the motor at idle and my garage no longer smells of fumes after parking the car overnite.Hope this helps a little.You dont need a T-bird valley cover, since anything labelled T-bird seems to be a lot of extra money. 58 up cars and trucks have the same hole located in the rear of the valley, but it can be difficult to find the right grommet for the application. Y trucks started using PCVs in '62 or '63. They have a neat little cap that bolts over the hole of discussion, and a hose attaches to the cap, to run either to the stock location on the 2V intake, or to a PCV port of a later carb. The actual PCV would be inline.
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By 55vickey - 16 Years Ago
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I'm running a 465 Holley on my 272, which base plate doesn't have a pcv port, so I'm running the pcv hose to the air cleaner, any pros or cons on this? Seems to be working fine so for. Gary
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By junkyardjeff - 16 Years Ago
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A local junkyard has a few of the 61-4 trucks and will check them for the pcv system and valley pan
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By oldcarmark - 16 Years Ago
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If you find one or more you might want to take them all if the price is right.always someone looking for one on this site.
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By PWH42 - 16 Years Ago
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63 64 pickups are the only 2 years that Y-Blocks were factory equipped with PCV.
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By Ted - 16 Years Ago
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junkyardjeff (7/04/2009)
Now can I still put on the earlier vent on a later motor for the look of originality only.
The road draft tube can be bolted back to the side of the engine for ‘looks’ by using an expansion plug in the block hole and cutting off the ‘U’ tube on the block side of the road draft tube that normally sticks back into the engine at that point. This will give you the originality look while stopping the potential for any oil leaks that can occur at that spot.
55vickey (7/5/2009)
I'm running a 465 Holley on my 272, which base plate doesn't have a pcv port, so I'm running the pcv hose to the air cleaner, any pros or cons on this? Seems to be working fine so for. Gary
Your description sounds like you have no vacuum to the PCV valve which in turn means it’s inoperative. A spacer under the carb with a direct vacuum port is the ideal option in hooking up the PCV valve in your case.
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By 55vickey - 16 Years Ago
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I fixed the pcv valve always open, so it's a direct line.....will it still be inoperative? Gary
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By paul2748 - 16 Years Ago
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The TBIrd parts suppliers have a kit which consists of a base plate with a nipple, valve and hose for both the A and B manifolds. It is designed top be used with the TBird valley cover, but can be used with the later car cover if the cover is like the TBird one.. Not sure about the truck cover. The later Fords had a spacer with a nipple, and you should be able to get that at a junk yard.
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By junkyardjeff - 16 Years Ago
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If I were to get a later 292 (60 to 64) is there even a place on the block for the earlier vent or will I have to drill the holes to mount it,it will be for looks only and not functioning.
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By Ted - 16 Years Ago
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55vickey (7/6/2009)
I fixed the pcv valve always open, so it's a direct line.....will it still be inoperative? GaryIf there’s not a vacuum on the PCV valve, then it’s simply a path for excess crankcase pressure to be routed to the air cleaner if you’ve modified the valve to just be open all the time. If not hooking it up to a vacuum source, it would be more effective just having the line going to the air cleaner without the PCV valve in place as the valve just becomes a restriction in the line at this point. By design, PCV valves are intended to be hooked up to direct vacuum source so that excess crankcase residuals can simply be recombusted by the engine.
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By Ted - 16 Years Ago
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junkyardjeff (7/6/2009)
If I were to get a later 292 (60 to 64) is there even a place on the block for the earlier vent or will I have to drill the holes to mount it,it will be for looks only and not functioning.The later model blocks varied as to what was supplied on the drivers sides of them for a road draft tube installation. While some had no holes whatsoever provided for a road draft tube installation, others had only the outside tapped holes with no center hole while even others had all the required holes which was covered by a factory blockoff plate. If the block doesn’t have the outer tapped holes for the road draft tube, the bosses are still there in which to drill and tap them into the blocks and facilitate the holes as being ‘blind’ threaded holes.
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By Outlaw56 - 16 Years Ago
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Any suggestions on which PVC valve (part #) would fit this valley cover in a 254 YBlock with under 200 HP? If I understand correctly, a good choice is to install the PVC in this location and run a vent tube to the 1/2 fiber insulator/adaptor between the edelbrock 500 and the manifold. I could also add a vent tube from the oil fill cap to the bottom of the air filter. This would eliminate the road draft tube and provide a closed system, correct?  
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By oldcarmark - 16 Years Ago
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If you get one for a Ford Mustang mid 60's with 289-302 should work.Take the pan with you to the parts store and get the PCV grommet to fit the hole and a PCV valve.The way you have described the setup is correct for a closed system.
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By DANIEL TINDER - 16 Years Ago
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Outlaw56,
You will likely have to drive down the threaded tube nut inside the baffle (that originally attached the draft tube) a bit, so the PCV valve will clear. Just make sure you don't warp the valley cover (unless you PLAN to seal it with RTV).
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By oldcarmark - 16 Years Ago
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I did not have to do any mod to my valley cover.Try a PCV before you go banging on it.Do NOT overtighten when you put the cover on.Specs call for 2-3 ft/lbs which is just snug.Overtightening will distort the cover and leaks will occur.Make sure the cover is flat as possible before you install.Previous owners may have overtightened it,
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By GREENBIRD56 - 16 Years Ago
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I built this fitting out of a copper 3-way tubing fitting, a big washer, and some JB weld. Rubber O-ring seals to the valley pan, rubber washer seals the bolt down thru the top - and the PCV valve is from a '64 292 truck motor. 
I just pushed the hose over the threaded end of the valve - so the check valve is working in the desired direction....
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