1967 Air Cleaner base on 327

[Ronald L.]

I recently had the opportunity to look at an early VIN approx 1100 - 327 67 car that appears to be unmolested and original.

The surprising thing was the air cleaner base was "less the extra bump" that we expect to see on 67 and up cars.

Any one else out these seen this?...are other early 67's out there with this 66 level air cleaner base?

[Scott S.]

Re: 1967 Air Cleaner base on 327

I recently had the opportunity to look at an early VIN approx 1100 - 327 67 car that appears to be unmolested and original.

The surprising thing was the air cleaner base was "less the extra bump" that we expect to see on 67 and up cars.

Any one else out these seen this?...are other early 67's out there with this 66 level air cleaner base?

Hi Ron, I found a Thread on this a while back, it might be of interest. I was able to find it again:

https://www.forums.ncrs.org/showthread.php?t=65275&uid=3934

[Ronald L.]

Re: 1967 Air Cleaner base on 327

Hi Scott, Hopefully Tim sees this thread as that one died at the point he was going to look at his Sep 66, 67 car. VIN 1100 would be right in this same time frame.

This 67 was automatic, 327, PS, PB, AC, and...a convertible. When I went for a ride in it with 98 ambient I was wishing his AC worked! (the belt was off the compressor).

[David L.]

Re: 1967 Air Cleaner base on 327

The change "on paper" from the 1966 Corvette 6422286 air cleaner assembly to the 1967 Corvette 6423909 took place on 7/11/66 as per the revision box in the AIM. It is unclear when the actual change took place on the assembly line. Also on 7/11/66 in the revision box the crankcase vent tube changed from 3887158 to 3902402. Enclosed is a a couple of photos of what I believe to be an original 3887158 tube from a 1966 Corvette 327. The length from end to end is 8" (straight line measurement C/L end to C/L end. What is the difference between the two tubes? Based on pictures of the reproduction 3909402 tubes that I have seen on the internet the only difference seems to be the bracket that is welded on to the tube near the end where the 1" hose is is attached.
I once owned a NOS 3902402 tube that I bought at Doble Chevrolet back in the early 1980's and as I remember the welded on bracket was somewhat different but I thought the tube was also much straighter than the reproductions. Does anyone have a photo of an original 3902402 tube?

[Kirk M.]

Re: 1967 Air Cleaner base on 327

I concluded that the base I had was a 66 air cleaner base. I assume that it would be possible during early production for one of these to make it on a car.


Kirk

[Timothy B.]

Re: 1967 Air Cleaner base on 327

Ronald,


I will get these pictures of the air cleaner base later today and post, I must have forgotten. The 67 is September 23 build date..

[Scott S.]

Re: 1967 Air Cleaner base on 327

Also on 7/11/66 in the revision box the crankcase vent tube changed from 3887158 to 3902402. Enclosed is a a couple of photos of what I believe to be an original 3887158 tube from a 1966 Corvette 327. The length from end to end is 8" (straight line measurement C/L end to C/L end.

David, what page has the revision to the crankcase vent tube? My '67 AIM shows the air cleaner change on 7-11-66 in the Revision section (UPC 6-C3) that you referenced, but the crankcase vent tube (Item 11, 3887158) is listed at the top of the page and there is no mention of a crankcase vent tube change in the Revision section of my UPC 6-C3 page.

Is this one of the pages that is different, depending on which Assembly Manual you have?

[Scott S.]

Re: 1967 Air Cleaner base on 327

Enclosed is a a couple of photos of what I believe to be an original 3887158 tube from a 1966 Corvette 327. The length from end to end is 8" (straight line measurement C/L end to C/L end.

That is definitely a different crankcase vent tube than I have (1967 L79, January 11 '67 build date).

I checked the L79 AIM section (only two pages). On UPC L79-A2 it lists parts that are NOT illustrated for the L79 R.P.O., including "6H Engine Ventilating System". If I understand correctly, that means the crankcase tube should be something other than 3887158 for the L79. When I checked GM# 3887158 in the parts book, it says "(327) (exc. Sp. H/Per.)".

The P&A listing for the Corvette vent tube described as "w/Sp. H/Per. (327)" is GM# 3849733. I don't have a picture though. Can anyone confirm whether the crankcase vent tube that I have (pictures below) is GM 3849733 and is correct for 1967 with L79?

Total straight line length between the two farthest points is just about 9". I haven't removed the end-piece hose yet, but measured from the end "lip" visible under the hose, so measurement should be close but not exact.

[Timothy B.]

Re: 1967 Air Cleaner base on 327

Ronald,

Here are pictures of the air cleaner base on my early 67. To the best of my knowledge this is the original base. I just noticed what looks like a oil wetted air cleaner from NAPA I bought sometime in the eighties.

Don't pay any attention to the bubba fix around the carburetor base area, that was the way it came to me. Probably at one time someone installed a different carburetor because the Holley got sick.

Also, Pictures of the breather tube on this engine.

[Ronald L.]

Re: 1967 Air Cleaner base on 327

Tim, Thanks for posting these photos, this clearly is the 67 327 base.

The VIN of the car I looked at was a little less that 1100, how close is that your car?

[David L.]

Re: 1967 Air Cleaner base on 327

David, what page has the revision to the crankcase vent tube? My '67 AIM shows the air cleaner change on 7-11-66 in the Revision section (UPC 6-C3) that you referenced, but the crankcase vent tube (Item 11, 3887158) is listed at the top of the page and there is no mention of a crankcase vent tube change in the Revision section of my UPC 6-C3 page.

Is this one of the pages that is different, depending on which Assembly Manual you have?

Scott,
My mistake. The change from the 3887158 tube to the 3902402 tube is NOT shown in the assembly manual but rather in Chevrolet Parts History as of Dec. 1966.

My 1966 Chevrolet Parts Catalog (effective Oct. 1965) lists 3887158 for the 66 Corvette (327)(exc. Sp.H/Per.) while my 1967 Chevrolet Parts Catalog (effective Apr. 1967) lists 3902402 for 66-67 Corvette (327)(exc. Sp. H/Per.). I would assume that 66 & early 67 Corvettes used the 3887158 tube while the late 67 Corvettes used the 3902402 tube. My question is what is the difference between the 3887158 and 3902402 tubes?

The 3849733 tube is listed for the 64-67 Corvette w/Sp. H/Per. (327). I believe the tube you have is GM # 3849733.

Dave

[David L.]

Re: 1967 Air Cleaner base on 327

Ronald,

Also, Pictures of the breather tube on this engine.

Tim,

Does the welded on bracket on your early 67 Corvette crankcase vent tube look like the bracket on my 3887158 crankcase vent tube as shown in my photos? I really can not see the entire bracket part in your photo of the crankcase vent tube.

Enclosed is a photo of a reproduction 3902402 tube. I took the picture of my monitor screen on the vendors website. The bracket appears to have another bend after the mounting hole. The bracket is simply welded on the tube of the reproduction as shown in the photo. My original 3887158 has 3 electric spot welds each about 0.17" in diameter.

Dave

[Timothy B.]

Re: 1967 Air Cleaner base on 327

Ronald,

The vin on this car is 14xx so it's within 350 cars of 1100.

David,

I believe the tube may be spot welded but if you want I can remove the air cleaner and try to get a better picture for you. The car is not at my house at this time so it may take a day.

[David L.]

Re: 1967 Air Cleaner base on 327

Ronald,

David,

I believe the tube may be spot welded but if you want I can remove the air cleaner and try to get a better picture for you. The car is not at my house at this time so it may take a day.

Tim,

You don't have to removed the air cleaner but just take a good look at the welded on bracket of your crankcase vent tube and see how it compares to the welded on bracket on my 3887158 bracket (photos on my Jan. 27, 2011 post @ 9:26 PM). It looks like the bracket on your crankcase vent tube has an additional vertical extension with a "hook type" tab. I believe your crankcase vent tube is GM # 3902402 (1967 Chevrolet Parts Catalog, effective Apr. 1967 in Gr. 1.762). Also, compare your crankcase vent tube to the photo of a reproduction 3902402 tube as shown in my Jan. 28, 2011 post @ 8:26 PM. I think the difference between the 3887158 and the 3902402 tubes is the vertical extension on the bracket of the 3902402 tube. I do not see any purpose for this vertical extension.

Dave

[Timothy B.]

Re: 1967 Air Cleaner base on 327

David,

I see what your talking about now, I will let you know what I find..