63 Crankcase ventilation plumbing

[Steve D.]

Joe C. et al

In a thread on Aug 20, among other topics I received comments regarding getting crankcase ventilation plumbed. Since then I have done some pondering and have some other questions. I have attached a schematic and some photos that I will refer to. The car is 63, but everything is not original and the block is a later year service replacement 327.

The basic question is this: is setting up the ventilation as in 64 and later dramatically better, or am I just about as well off plumbing the ventilation in the 63 manner?

(See photo)I have a rubber plug in the crankcase vent with a shaped metal tube inserted into it. (At the moment, this is not connected to any thing) This appears to be a 63 venting arrangement. I have an Edelbrock carburetor, with an available vacuum port in the front. The air cleaner base is aftermarket (for clearance purposes) and does not have a connection for a ventilation hose; but one could be inserted. The easiest route would seem to be as shown in the attached schematic: 1) Connect the crankcase vent tube to the vacuum port in the front of the carburetor. 2) Tap the air filter base and insert a tube that will accept a small hose from the oil filler tube. 3) Connect hose from the oil filler tube to a PCV valve, then connect hose from PCV vale to air filter base.

To connect 64-and-later style, I would need to get a different crankcase vent tube and tap a larger tube into the air filter base. Unless the gain is significant, I would just as soon take the easy route.

Steve

[Joe L.]

Re: 63 Crankcase ventilation plumbing

Joe C. et al

In a thread on Aug 20, among other topics I received comments regarding getting crankcase ventilation plumbed. Since then I have done some pondering and have some other questions. I have attached a schematic and some photos that I will refer to. The car is 63, but everything is not original and the block is a later year service replacement 327.

The basic question is this: is setting up the ventilation as in 64 and later dramatically better, or am I just about as well off plumbing the ventilation in the 63 manner?

(See photo)I have a rubber plug in the crankcase vent with a shaped metal tube inserted into it. (At the moment, this is not connected to any thing) This appears to be a 63 venting arrangement. I have an Edelbrock carburetor, with an available vacuum port in the front. The air cleaner base is aftermarket (for clearance purposes) and does not have a connection for a ventilation hose; but one could be inserted. The easiest route would seem to be as shown in the attached schematic: 1) Connect the crankcase vent tube to the vacuum port in the front of the carburetor. 2) Tap the air filter base and insert a tube that will accept a small hose from the oil filler tube. 3) Connect hose from the oil filler tube to a PCV valve, then connect hose from PCV vale to air filter base.

To connect 64-and-later style, I would need to get a different crankcase vent tube and tap a larger tube into the air filter base. Unless the gain is significant, I would just as soon take the easy route.

Steve

Steve-----


I don't think there is any significant gain to be achieved by converting to the later style PCV system. There might be from an emissions standpoint but I do not expect that's much of a priority for you.

[Steve D.]

Re: 63 Crankcase ventilation plumbing

I guess the PCV valve should go in the line to the vacuum port, instead of the line to the air cleaner

[Timothy B.]

Re: 63 Crankcase ventilation plumbing

Steve,

Looking at your engine picture I can't see the tube from the back of the block. The tube can be attached to a fitting on the front of the carburetor like you state. After that you could modify the air cleaner to accept the hose from the oil fill tube so under hard acceleration if the circulation reverses, the carburetor venturi vacuum will draw the vapor and the system stay closed to atmosphere, that's the best way with your existing set up.

In the future if you keep the car, you might consider buying a repro 1963 air cleaner and find a nice 3721SB carburetor to use and everything will bolt up as original. Your motor looks nice..

[Steve D.]

Re: 63 Crankcase ventilation plumbing

Tim

Thanks for your reply. In the photo, if you look just to the left of the coil, you can see the vent tube peeking out.

Steve

[Timothy B.]

Re: 63 Crankcase ventilation plumbing

Steve,

I see it now, if that tube is the 63 style it should peek through between the coil and distributor vacuum advance.

[Duke W.]

Re: 63 Crankcase ventilation plumbing

You need to have a PCV valve between the block outlet and carburetor port. Use any PCV valve with hose connection ends that was used on a vintage small block. It should be easy to implement.

You also must have a provision for a fresh air inlet, so you need to add a appropriate nipple to the air cleaner to run a hose from the oil tube nipple to the air cleaner.

Duke

[Steve D.]

Re: 63 Crankcase ventilation plumbing

Tim

The tube came with the car, but like a lot of items it may not be 63 correct. (Note that the oil fill tube is 64) However, it may be that I just have it routed incorrectly. I'll check this evening to see if the bends are such that it will fit between the coil and distributor.

[John H.]

Re: 63 Crankcase ventilation plumbing

The tube came with the car, but like a lot of items it may not be 63 correct. (Note that the oil fill tube is 64) However, it may be that I just have it routed incorrectly. I'll check this evening to see if the bends are such that it will fit between the coil and distributor.

Steve -

Here's what the routing of the '63 rear crankcase vent pipe and hose looks like.