1967 hose clamps, L79 with C60 - JG is unclear, what is correct?

[Scott S.]

January 1967 coupe (#07873), L79 with air conditioning.



The following is a list of clamps that were removed from the car:

1)
Type: Side-screw style, slotted band



2)
Type: Side-screw style, slotted band
Stamped on the band: Size 10


3)
Type: Side-screw style, slotted band
Stamped on the band: Size 12


4)
Type: Side-screw style, slotted band
Stamped on the band: DIA 1-1/16 Size 10


5)
Type: Side-screw style, slotted band
Stamped on the band: NO 24 1-1/16 to 2


6)
Type: Side-screw style, slotted band
Stamped on the band: NO 10 9/16 to 1-3/8


7)
Type: Side-screw style, slotted band
Stamped on the band: BREEZE Union N.J. M12 (was on the bottom pipe fitting of the expansion tank)


8)
Type: Solid band with square nut retainer, with separate screw & square nut


9) 1 x mini-Wittek tower clamp on evaporator box drain tube (not shown, slotted indented hex-head screw broke off at clamp, is it possible to remove this clamp without destroying it?)
Type: Tower (very small)
Stamped on the band: not sure, hard to read until I get it removed and cleaned.


10)
Type: Side-screw style, slotted band, with integral LOCATING arm




No Corbin clamps found anywhere?




Should the second clamp on the expansion tank be a duplicate Wittek solid band-clamp? Are there ANY Corbin-type clamps on an L79 with C60?



I will post what the 1967 JG says about the various clamps in the next post.

[Scott S.]

Re: 1967 hose clamps, L79 with C60 - JG is unclear, what is correct?

The details are sometimes missing regarding clamps for small blocks in the 1967 JG, but in some cases are present in the big block section. In the absence of specifics in the small block section, do the big block clamps apply to the L79 small block?

From the 4th edition 1967 JG on various hose clamps:


Air Cleaner
Attachment, Labels, Hoses and Clamps

-Small block, p. 75 (no mention of clamps)

-Big block


Fuel System & Intake Manifold
Choke Assembly, Tags, Hoses and Clamps

-Small block, p. 76 (no mention of clamps)

-Big block, p. 103 (no mention of type of clamp)


Fuel Delivery System
Engine Compartment: Lines, Fittings and Clamps

-Small block

-Big block, p. 106 (no mention of clamps)


Water Pumping System
Radiator Hoses & Clamps

-Small block, p. 85 (no mention of clamps)

-Big block

Question: Do these Wittek tower clamps also apply to the L79 (and/or base engines, for future archive searches)?


Bypass Hose & Clamps

-Small block

-Big block


Heater Hoses, Clamps & Clips

-Small block, p. 85 (none for C60 cars?) non

-Big block

Question: Do these same clamps in this section also apply to the L79 (and/or base engines, for future archive searches)?



Heater or Air Conditioning System
Hoses, Pipes, Clamps and Grommets

-Small block

-Big block


Expansion Tank Balance Hose

-Small Block

-Big Block


Question: What kind of clamp is used to attach the hose at the right side radiator overflow outlet (Wittek? Tower? Side-screw? Solid band, or slotted?), and does the opposite end attach to the Expansion tank with the solid band Wittek?

[John H.]

Re: 1967 hose clamps, L79 with C60 - JG is unclear, what is correct?

Scott -

The only correct clamps I see in the photos are the worm clamps on the refrigerant hoses, if they have locator legs on them.

All the heater hoses have Corbin clamps, except the two side-screw clamps between the 3/4" hose tee and the expansion tank outlet.

The balance hose from the radiator to the expansion tank inlet uses a small side-screw clamp at each end, and the overflow hose doesn't use a clamp.

[Scott S.]

Re: 1967 hose clamps, L79 with C60 - JG is unclear, what is correct?

Scott -

The only correct clamps I see in the photos are the worm clamps on the refrigerant hoses, if they have locator legs on them.

All the heater hoses have Corbin clamps, except the two side-screw clamps between the 3/4" hose tee and the expansion tank outlet.

The balance hose from the radiator to the expansion tank inlet uses a small side-screw clamp at each end, and the overflow hose doesn't use a clamp.

Hi John,

All six of the worm clamps for the refrigerant hoses do have the locator leg, but they are more detailed than the description in the JG.

The JG says about the refrigerant hose clamps: "Observed original clamps are manufactured by the Murray Corporation of Towson, 4, Maryland, and are stamped as such on their main body." Mine have all of that information, but also have "GOLD SEAL" in large letters, just below the "Murray Corp." (not "Corporation").

All six of my refrigerant hose clamps are identical to the one pictured below.

.

[Scott S.]

Re: 1967 hose clamps, L79 with C60 - JG is unclear, what is correct?

Page 138 of Richard Newton's "Corvette Restoration Guide 1963-1967" (published 1998) shows the back of the A6 compressor with the muffler and one of the side-screw clamps with the locator leg. In the caption below the picture it says (in part): "The original clamps were manufactured by the Murray Corporation of Maryland, or by Hy-Gear."

I have not seen the "Hy Gear" name mentioned in any of the other books or guides, but there were three "Hy Gear" side-screw worm clamps that came off this car. All three say on the main body. Two are size 10, one is size 12.

The example pictured below is the size 10, both size 10 clamps were on the bypass hose. Is there any chance these are correct original clamps on this January 11 1967 car?

.

[Michael H.]

Re: 1967 hose clamps, L79 with C60 - JG is unclear, what is correct?

As John Hinckley mentioned, all of the clamps for the long heater hoses are the corbin spring ring style. There is one exception though. The 3/4" hose at the water pump on cars with air conditioning used a worm adjustable (auto parts/gas station) clamp.
This is the case for at least 65 and 66 as I remember, and I believe 67 also. Check your 67 AIM.

[John H.]

Re: 1967 hose clamps, L79 with C60 - JG is unclear, what is correct?

There is one exception though. The 3/4" hose at the water pump on cars with air conditioning used a worm adjustable (auto parts/gas station) clamp.
This is the case for at least 65 and 66 as I remember, and I believe 67 also. Check your 67 AIM.

Michael -

That's correct - the 3/4" hose at the water pump fitting is the exception to the Corbin clamp usage on 67's with A/C as well.

[Scott S.]

Re: 1967 hose clamps, L79 with C60 - JG is unclear, what is correct?

As John Hinckley mentioned, all of the clamps for the long heater hoses are the corbin spring ring style. There is one exception though. The 3/4" hose at the water pump on cars with air conditioning used a worm adjustable (auto parts/gas station) clamp.
This is the case for at least 65 and 66 as I remember, and I believe 67 also. Check your 67 AIM.

[Scott S.]

Re: 1967 hose clamps, L79 with C60 - JG is unclear, what is correct?

As John Hinckley mentioned, all of the clamps for the long heater hoses are the corbin spring ring style. There is one exception though. The 3/4" hose at the water pump on cars with air conditioning used a worm adjustable (auto parts/gas station) clamp.
This is the case for at least 65 and 66 as I remember, and I believe 67 also. Check your 67 AIM.

Michael or John, do you know what this clamp for A/C cars at the water pump looks like? Size stamped into the band, slotted band vs. solid band, brand (Wittek or other?), etc.? Are there reference pictures for any of these clamps?

I found an excellent article today on the exact subject of hose clamps by John Amgwert, Winter 1978 Restorer, but I don't have my CD anymore so I can't see any of the pictures or charts. In the last paragraph he stated "I should in closing mention that the often seen clamp sometimes referred to as on "aircraft" type (see photo), while currently used by GM and available everywhere (example: Ideal or Sure-tite) was not used on the production of 1953-1967 model Corvettes (except on air conditioning)." - boldface emphasis mine


Several of my side-screw slotted-band worm clamps are "Ideal" brand:

2 x "Ideal - USA" over "All Stainless" on the clamp body

1 x "Ideal Corp." over "HY GEAR" over "B'KLYN, NY" on the clamp body with round-head slotted screw (prominent in post 5)

2 x "Ideal Corp." over "HY GEAR" over "B'KLYN, NY" on clamp body with hex-head slotted screw (secondary in post 5, far end of bypass hose)

1 x "Ideal Corp." over "COMBO-HEX" over "MADE IN USA" on the clamp body with hex-head slotted screw


I would like to replace incorrect clamps with correct clamps, but I would like to avoid replacing clamps that might be less well-known, but nonetheless original, to the car.

This is an interesting subject, one where picture references would be very helpful.

[Scott S.]

Re: 1967 hose clamps, L79 with C60 - JG is unclear, what is correct?

This clamp was attached to the balance hose connection at the Expansion tank. The 1966 JG is more detailed about this clamp than the similarly worded 1967 JG:

"Balance hose
On Small Blocks, a hose is routed from the right top side radiator overflow outlet, then outboard of the hood support continuing to the expansion tank secured to the inner skirt with three black plastic push-in straps. The 'GM' logo, within a square box, is stamped in blue ink at approximately 4" or 1-1/2" intervals. Both ends of the hose are secured with cadmium or zinc plated "2" Wittek side screw clamps (Wittek Mfg. Co. , Chicago, U.S.A.) with a Fillister head slotted screw." - 1966 JG, p. 163



Here are pictures of the Wittek band-clamp that was on the Expansion tank, stamped "2", with a Fillister head slotted screw that was in the position of Item 4 on UPC 11-13/Sheet A5 (the 11 o'clock pipe fitting if you are looking at the Harrison logo on the Expansion tank).


.