spring clips on PVC hose

[Scott S.]

Re: spring clips on PVC hose

Hi Charles:

Since you have a 67, I thought I would add to the other responses by noting that I think the PCV clamp used in 1967 had one rounded tang and two that were sort of straight, as shown in the attached photo.

Earlier C2s had three flat tangs, but the 67 clamp was the first step in converting to rounded tangs. In later years I think all three tangs were rounded, as the current repro units are.

I'd be interested in responses from other's who have studied original 67 PCV clamps.

Joe,

The picture you posted is identical to my two '67 PCV hose clamps. The side opposite the tangs is stamped with a "D" on both.

[Michael H.]

Re: spring clips on PVC hose

In the mid 70's, I ordered/received about 10 or 20 of both the black (vacuum) and green (fuel) line clamps. I still have (somewhere) about 5 or 6 of the black clamps and one has the rounded ends that are described above.

[Ronald L.]

Re: spring clips on PVC hose

Joe R,

You mean like these?

[David L.]

Re: spring clips on PVC hose

I have collected dozens of PCV valves from 1960's junk yard Chevrolets over the last 30 years. I always saved the spring clamps. Pictured are two original spring clamps. The one on the left measures measures 5/16" in width and the one on the right measures 3/8" thick. Both have a black finish on them (black phosphate or black oxide???).

The part number listed in all my 1964-1973 Corvette, Chevrolet, and Camaro AIM's is 3829058.

GM # 3829058 is described as "CLAMP (spring type - 5/8 free I.D.)(black paint)" in my 1966 Chevrolet Parts Catalog (effective Oct. 1965) in Gr. 1.166 as well as Gr. 1.750.

GM # 3829058 was replaced with GM # 1470029 in Nov. 1970 as per Chevrolet Parts History.

I will see if I can find my other spring clamps.

Dave

[Ronald L.]

Re: spring clips on PVC hose

Dave,
Black oxide offers ZERO corrosion protection so given the fact these have not rusted in your parts collection inside, away from the elements - at a minimum black phos. To be closer to exact, by the mid 70's they were coated with an organic finish after the phos to get better corrosion protection. A print for this part number would tell us the start date for sure. It looks like the part on the left is a phos part unless the organic finish was removed in cleaning.

[Michael H.]

Re: spring clips on PVC hose

I have collected dozens of PCV valve from 1960's junk yard Chevrolets over the last 30 years. I always saved the spring clamps. Pictured are two original spring clamps. The one on the left measures measures 5/16" in width and the one on the right measures 3/8" thick. Both have a black finish on them (black phosphate or black oxide???).

Dave

The clamp on the left appears smaller and possibly dark green?? Is that a fuel line clamp? The one on the right appears to be larger and black, like a power brake vacuum hose clamp.

[David L.]

Re: spring clips on PVC hose

The clamp on the left appears smaller and possibly dark green?? Is that a fuel line clamp? The one on the right appears to be larger and black, like a power brake vacuum hose clamp.

Michael,

The 5/16" wide clamp on the left appears to be dark gray phosphate or something similar. The 3/8" wide clamp on the right is black (not paint) and is stamped with the letter "U" inside a "diamond". Unfortunately I did not do a very good job "bagging and tagging" these spring clamps back in the 1980's. Whenever I sold original PCV valves I usually included the original spring clamp. I will try to find my other PCV valve spring clamps.

I know that I have some GREEN NOS and original fuel line spring clamps as well in my "collection".

Dave

[David L.]

Re: spring clips on PVC hose

I just found an original "CV-736C" PVC valve (w/4 "punch marks") with the original 3/8" wide black spring clamp stamped "U" inside a "diamond" (assumed to be GM # 3829058) that I removed from a 1970 Chevrolet w/350 eng. on 02/15/1992 from a junk yard in Ashburnham, MA.

Also, I have an original "CV-736C" PVC valve (w/9 "punch marks") with the original 5/16" wide black spring clamp (assumed to be GM # 1470029) that I removed from a 1972 Chevelle Malibu S.W. w/307 engine ("LY" glass code = March 1972) from the same junk yard on the same day.

I guess that I "bagged and tagged" these parts at least somewhat correctly.

Dave

[Michael H.]

Re: spring clips on PVC hose

Michael,

The 5/16" wide clamp on the left appears to be dark gray phosphate or something similar. The 3/8" wide clamp on the right is black (not paint) and is stamped with the letter "U" inside a "diamond". Unfortunately I did not do a very good job "bagging and tagging" these spring clamps back in the 1980's. Whenever I sold original PCV valves I usually included the original spring clamp. I will try to find my other PCV valve spring clamps.

I know that I have some GREEN NOS and original fuel line spring clamps as well in my "collection".

Dave

Dave,

One of each, NOS. (purchased in the early 70's) Green is fuel line and black is power brake/PCV.

[David L.]

Re: spring clips on PVC hose

Dave,

One of each, NOS. (purchased in the early 70's) Green is fuel line and black is power brake/PCV.

Michael,

Does the black spring clamp have the letter "U" stamped inside a "diamond"?

Dave

[Peter L.]

Re: spring clips on PVC hose

I think that's for my 66.

[Michael H.]

Re: spring clips on PVC hose

Michael,

Does the black spring clamp have the letter "U" stamped inside a "diamond"?

Dave

I think so but I'll have to dig them out and look to be sure. The pic was from a few years ago, from the last time I dug them out.

[Ronald L.]

Re: spring clips on PVC hose

David, here is the pic I planned to attach, 736 valve, hose and clamp in place, plus the grommet too. Note the rounded tip on this end, the other end of the hose had all 3 tangs squared off.

[Michael H.]

Re: spring clips on PVC hose

Michael,

Does the black spring clamp have the letter "U" stamped inside a "diamond"?

Dave

Dave,

I found the bag of NOS clamps. Not many left. Here's what I have.

4 NOS black PCV/vacuum line hose clamps. Only one has the diamond with the letter U. Three have squared ends. One has rounded ends. The one with rounded ends is the only one that has the diamond with the letter U.

5 NOS green (dark olive drab) fuel line hose clamps. Three have the diamond/U and square ends.
One has square ends but no diamond/U. One has rounded ends but no diamond/U.

I really don't think anyone can say, with certainty, that any/all original clamps absolutely had to be a certain configuration. I would have to guess that GM had more than one supplier for these clamps. Or, possibly, one supplier had more than one machine that did the stamping.

[John H.]

Re: spring clips on PVC hose

Those clamps were made on a Fourslides machine at about 500 per minute.