1964 PCV valve location

[David L.]

Could some tell me where the PCV valve is located on a 1964 Corvette 327 engine? Were PCV valves used only on "early" 1964 Corvettes similar to the 1963?

The 1963 PCV valve attaches to the back side of the carburetor via a brass elbow, GM # 444040, as shown in the 1963 AIM (UPC 6, sheet C3).

The 1964 Corvette assembly manual (Sect. 6, sheet C3.00) does not show a PCV valve at all. The drawing shows a connector (GM # 3853720) at the back side of the carburetor connecting to the oil filler tube with hose # 3846107.

My 1964 and 1965 Chevrolet Parts Catalogs (Oct. 1963 and Oct. 1964) lists PCV valve # 5649689 (CV-590) for 1963 and 1964 Corvettes.

Dave

[Michael H.]

Re: 1964 PCV valve location

Could some tell me where the PCV valve is located on a 1964 Corvette 327 engine? Were PCV valves used only on "early" 1964 Corvettes similar to the 1963?

The 1963 PCV valve attaches to the back side of the carburetor via a brass elbow, GM # 444040, as shown in the 1963 AIM (UPC 6, sheet C3).

The 1964 Corvette assembly manual (Sect. 6, sheet C3.00) does not show a PCV valve at all. The drawing shows a connector (GM # 3853720) at the back side of the carburetor connecting to the oil filler tube with hose # 3846107.

My 1964 and 1965 Chevrolet Parts Catalogs (Oct. 1963 and Oct. 1964) lists PCV valve # 5649689 (CV-590) for 1963 and 1964 Corvettes.

Dave

For 64, I think a new "metered orifice" fitting was used on most engines instead of a PCV valve.

There was one exception that I can think of that still used the CV-590 valve though.

[Duke W.]

Re: 1964 PCV valve location

I don't think any '64-'65 Corvette small block engines used PCV valves, but then all '66 engines did. Chevrolet was still playing around with trying to find the best design back then.

Your '64 AIM should have all the details.

Duke

[Michael H.]

Re: 1964 PCV valve location

I don't think any '64-'65 Corvette small block engines used PCV valves,
Duke

I think there was one. I'm sure someone will figure it out.

[Michael M.]

Re: 1964 PCV valve location

My 65 SB doesn`t have one.

[Timothy B.]

Re: 1964 PCV valve location

On the FI engines??

[Jim T.]

Re: 1964 PCV valve location

Do not have my 64 convertible any more, but I do have the 1964 Corvette Shop Manual I bought in 1968 for it. On page 6-2 at the bottom "Crankcase Vent Valve" "Metered orifice-clean at each tune-up". This is in the 1964 Engine Tune-Up Specifications on the left side of the page.

[Duke W.]

Re: 1964 PCV valve location

I think there was one. I'm sure someone will figure it out.

"I don't think any '64-'65 Corvette small block engines used PCV valves, but then all '66 engines did. Chevrolet was still playing around with trying to find the best design back then."


Note that I said small block. I believe the L-78 did have a PCV valve.

Duke

[Michael H.]

Re: 1964 PCV valve location

"I don't think any '64-'65 Corvette small block engines used PCV valves, but then all '66 engines did. Chevrolet was still playing around with trying to find the best design back then."


Note that I said small block. I believe the L-78 did have a PCV valve.

Duke

Ok, but big block 65 didn't use a PCV valve.

Here's more info. It was 64 only and early production only.

[David L.]

Re: 1964 PCV valve location

For 64, I think a new "metered orifice" fitting was used on most engines instead of a PCV valve.

There was one exception that I can think of that still used the CV-590 valve though.

Michael,

Do you think that the connector (GM # 3853720, 1 13/16" developed length as per my parts catalogs) that is attached to the back side of the carburetor acted as a "metered orifice"? The connector is an elbow with a threaded end and a tube end. In the revision record GM # 3853720 replaced GM # 3846109 on 9/5/63.

Dave

[Michael H.]

Re: 1964 PCV valve location

Michael,

Do you think that the connector (GM # 3853720, 1 13/16" developed length as per my parts catalogs) that is attached to the back side of the carburetor acted as a "metered orifice"? The connector is an elbow with a threaded end and a tube end. In the revision record GM # 3853720 replaced GM # 3846109 on 9/5/63.

Dave

Dave,

My memory is a bit fuzzy on the fitting for 64-65 with carburetor but I think that is the restrictor fitting. (I don't remember the part number change)
If someone happens to have either a 64 or 65 AIM handy, I think we can confirm the fitting by looking in the L84 fuel injection section. I think the same restrictor is used on the front of the plenum on these units??

[David L.]

Re: 1964 PCV valve location

Dave,

My memory is a bit fuzzy on the fitting for 64-65 with carburetor but I think that is the restrictor fitting. (I don't remember the part number change)
If someone happens to have either a 64 or 65 AIM handy, I think we can confirm the fitting by looking in the L84 fuel injection section. I think the same restrictor is used on the front of the plenum on these units??

Michael,

In both the 1964 & 1965 AIM (UPC L84, sheet 5.00) the drawing shows a production connector (no part number given, assumed to be 3853720) on the front of the plenum that connects to the oil filler tube with hose 3854238. Below is a link to a reproduction 3853720 "Vacuum Restriction Fitting" by Paragon.

Dave

https://www.paragoncorvette.com/p-35...n-fitting.aspx

[Michael H.]

Re: 1964 PCV valve location

Michael,

In both the 1964 & 1965 AIM (UPC L84, sheet 5.00) the drawing shows a production connector (no part number given, assumed to be 3853720) on the front of the plenum that connects to the oil filler tube with hose 3854238.

Dave

Dave,

Too bad no part number shown. I couldn't remember if the fitting was St Louis added or if it arrived from Rochester with it.
Either way, I know it was a restrictor and possibly/probably the same as the one used for engines with carburetors.

[Alan D.]

Re: 1964 PCV valve location

I believe that the pn is 3846107 (which replaced 3846109 in 9/5/63) No its 3853720!
It is shown in 64AIM, Sec6 sheetC3.00 as # 14. NO as #13
Then again in SecL76 sheet1.00/3.00 with no part number, but in SecL84 sheet5.00 it is marked as "Prod Connector" I show it referenced to Gr 8.963 which I do not have.

[David L.]

Re: 1964 PCV valve location

I believe that the pn is 3846107 (which replaced 3846109 in 9/5/63)
It is shown in 64AIM, Sec6 sheetC3.00 as # 14.
Then again in SecL76 sheet1.00/3.00 with no part number, but in SecL84 sheet5.00 it is marked as "Prod Connector" I show it referenced to Gr 8.963 which I do not have.

Alan,

In the 1964 AIM (SECT 6, SHEET C3.00)
GM # 3846107 is the part number for the hose (#14 in "box").
GM # 3853720 (#13 in "box") is the part number for the connector which before 9-5-63 was 3846109 according to the revision record.

Dave