67 hose clamps for PCV hose and fuel hose

[Joe R.]

I'm trying to clarify exactly what characteristics are correct for the PCV hose clamps and fuel line hose clamps on my 67. I have been told during judging that the original clamps have "square" ends on the ears and that the ears are "long." The reproduction clamps presently on my car do not meet these criteria.

The photo below shows what I have been told is a correct PCV hose clamp for 1967. Note that only the two outboard ears are squared, while the center ear is rounded. Also, the outer ears are not really square, since they have a small radius on the inside corner. The length of the outer ears, measured on the back side from what would be the surface of the hose, is about 1/4 inch.

I have seen other styles that are claimed to be "correct," with all three ears squared off and the ears generally shorter than the two outer ones in the photo below. My questions are as follows:

1) Is the clamp in the photo below a correct PCV hose clamp for 1967?

2) Are there other variations that are also considered to be correct?

3) Do the smaller fuel hose clamps have the exact same characteristics as the one in the photo below, or are they different? If someone could post a photo of a correct fuel line clamp, I would very much appreciate it.

[Gerard F.]

Re: 67 hose clamps for PCV hose and fuel hose

Joe,

I'll check mine tomorrow AM as I think I still have my originals on. But the color green or olive dichromate comes to mind.

Jerry Fuccillo
#42179

[Joe R.]

Re: 67 hose clamps for PCV hose and fuel hose

Hi Jerry:

It would be great if you have your original clamps and could post photos.

I believe that the PCV hose clamps (such as the one in the photo I posted) were black oxide, while the fuel hose clamps were green zinc chromate.

My main interest right now is understanding the specific details of the how the ears were shaped on both types of clamps.

[Michael H.]

Re: 67 hose clamps for PCV hose and fuel hose

I'm not 100% sure that these are exactly the same as mid 60's production but they came from GM about 30 years ago so I suspect that they are correct. I ordered a bag of each part number, one for fuel line and the other for PCV hose. The olive/zincrom clamp is the smaller of the two but I don't remember which is which. (fuel line/PCV) The ears are definitely sharp, squared off at the ends. On the other side, each has a mfg symbol, the letter "U" inside of a diamond. Hope this helps.

[Michael H.]

Re: 67 hose clamps for PCV hose and fuel hose

As I was looking at more of the clamps in this bag, I discovered that they are NOT all the same. Just learned that roughly 10% have rounded ears. Look at the clamp on the far left. Soooo... looks like possibly there were a few different versions of these? Both styles have the same "U" in a diamond logo on the back side.

[Donald T.]

Re: 67 hose clamps for PCV hose and fuel hose

Hi Guys!

I have an original example of a 64-65 PCV hose and clamps for L76/L79. This is from a 65 intake and carb set up removed in the early 70's. However, I do not know if the clamps are the same as 67. The link below has several pics of the hose and clamps, along with a comparison to a repo. Several differences can be noted. The original GM markings on the hose are more brown, which could be due to age. However, the font is completely different. The clamps definitely have longer legs. The outer legs are curved on the inboard side and then straight on the outboard side. The center leg is curved, but longer than the repo. The paint on the original appears to have been dipped and it is higher gloss than the repo. The manufacturer's mark on the original clamp is a capital "D".

Don Terry




65 PCV Photo Album

[John M.]

Re: 67 hose clamps for PCV hose and fuel hose

I have not seen the clamp shown used on 1967 and older, I have seen both the U and D logo with square tangs used in 1967 and later, the clamps for the Power brake line are aprox .380 wide and the PCV are .320, all I have seen have a dark to black finish, the fuel line clamps have the known green finish and all the tangs are square and the U logo ....This is only what I think I know today....Happy new year John Meissinger

[Michael H.]

Re: 67 hose clamps for PCV hose and fuel hose

I don't have the AIM handy but I thought the power brake and PCV hoses used the same black clamp?

[Robert Jorjorian]

Re: 67 hose clamps for PCV hose and fuel hose

My 65 AIM lists the PB and PCV hose clamp as both being # 3829058.

[Michael H.]

Re: 67 hose clamps for PCV hose and fuel hose

Ok, thanks Robert. I was pretty sure they were the same part/number.

[Terry M.]

spring clamps with squared ears

Michael,

Do you recall when did you buy those bags of clamps?

For 1968-1972 we look for the squared ears on the spring type clamps. I believe sometime in the later 1970s the ears were rounded for safety reasons.

[Gerard F.]

Re: 67 hose clamps for PCV hose and fuel hose

Joe,

Found my 67 original PVC clamps (I have the repros on the car):


The fuel line clamp on the left is probably a repro from when I changed the fuel sender. However, the other four on the car look identical and don't remember changing the one's for the fuel pump (but they could be all repros could have).

The fuel inlet has a U in a diamond. Can't read any markings on the PVC clamps due to the corroded finish.

I'm sure about the PVC clamps, not so on the fuel clamps.

The repro PVC clamps on the car have the narrow tabs rounded both sides and all tabs are slightly shorter than the originals.

Jerry Fuccillo
#42179

[Michael H.]

Re: spring clamps with squared ears

Best guess would be about 1976 Terry. It looks like stock was beginning to change when I received the order because of the mix of clamp designs. The problem is, this had to be a very slow moving part so current stock at warehouses may be several years old. The clamps on the assy line changed over frequently so a new design would probably show up in production faster than in service.

The Clamps with the rounded ends has a crisp mfg logo but the ones with the squared off ends have a very shallow stamp, very difficult to see.

[Robert Jorjorian]

Corbin clamp variations by John DeGregory

Michael, it might be a good time to discuss the differences in corbin clamps while on the clamp subject.
Unlikely John D can explain what years used long legs verse the later short legs so its up to you.Robert

[Terry M.]

Re: spring clamps with squared ears

"The Clamps with the rounded ends has a crisp mfg logo but the ones with the squared off ends have a very shallow stamp, very difficult to see."

Just guessing, but maybe new tooling for the rounded ears?