Power brake hose clamps, what color green?

[Scott S.]

Re: Power brake hose clamps, what color green?

Sorry Michael, misread your previous post.

Ok, so black it is.

My next question is this. How do I prove that on the judging field?

Chris,

In the 1967 P&A, Group 1.166, the hose clamp in question is listed this way:

ALL ALL, CORVETTE . . . . . . . . . . . . . . . (spring type — 5/8 free I.D.) (black paint) . . . 3829058 . . . A.R. (1.750)


Black paint, or black colored, anyway.


Edit: I see that Michael already posted this information in post #38 above

[Michael H.]

Re: Power brake hose clamps, what color green?

John and Mike,

If you look closely at your 1967 AIM, or better yet, scan page UPC J50-A3 and then enlarge it, I think you will see that what looks like a "6" at the end of the Item 2 Clamp part number is actually an "8", making it the same part number as called out in the 1966 AIM. The "8" in the '67 AIM is slanted to the right, as if it was italicized (e.g., "8"), and the uppermost right-hand portion was cut off during the copying process, making it appear to be a "6".

If there has ever been a part number GM 3829056, I have not yet been able to find it.

Scott,

I think you are correct. I can find no info on a clamp part number 3829056. I think it should be 3829058.

The PB vacuum hose and PCV hose are roughly the same size and I believe the color code, black, was used for the 3829058. Pretty sure all of the original 67's I've seen had black clamps.

[Edward J.]

Re: Power brake hose clamps, what color green?

Scott, I believe the power brake booster hose was a bigger dia. than a pcv hose thats why the black clamp.It was used for many years. As stated green was a PCV clamp or fuel line clamp.I was a long time GM tech. and don't ever remember seeing a green clamp on a booster hose. The clamp colors where used to help with assy.there were many different size hose. the clamps colors I remember were yellow,red,green, black.

[Michael H.]

Re: Power brake hose clamps, what color green?

Scott, I believe the power brake booster hose was a bigger dia. than a pcv hose thats why the black clamp.It was used for many years. As stated green was a PCV clamp or fuel line clamp.I was a long time GM tech. and don't ever remember seeing a green clamp on a booster hose. The clamp colors where used to help with assy.there were many different size hose. the clamps colors I remember were yellow,red,green, black.

Edward,

The only location for the slightly smaller 3786276 green clamp was for the fuel line at the pump and tank.

The black 3829058 was used for the PCV hose and power brake hose.

[Scott S.]

Re: Power brake hose clamps, what color green?

Scott, I believe the power brake booster hose was a bigger dia. than a pcv hose thats why the black clamp.It was used for many years. As stated green was a PCV clamp or fuel line clamp.I was a long time GM tech. and don't ever remember seeing a green clamp on a booster hose. The clamp colors where used to help with assy.there were many different size hose. the clamps colors I remember were yellow,red,green, black.

Ed,

I don't have anywhere near your amount of experience, I am only going by what is called out in the AIMs and what was on the one car that I'm really familiar with, a '67 small block that has been in our family since 1976, but I think we are mostly in agreement about the clamps. If I understand correctly, no green clamps on the brake booster hose, those should be black; green clamps were only used on the fuel hose. It is only the PCV hose clamp that seems to be in question.

The GM 3829058 is called out for the brake booster hose (1963-1967 AIM), and that part number is described as having "black paint" in the older Chevrolet P&A catalogs. I don't think there is any question that the 1966 AIM calls out the black GM 3829058 Clamp at both the brake booster hose location and the PCV hose location (UPC J50-A3 and UPC 6-C3). I believe that the 1967 AIM also calls out the same part number (the black GM 3829058) clamp at both the brake booster hose and the PCV hose locations, but in the '67 AIM on the power brake booster hose clamp page (UPC J50-A3), the last digit of the part number can easily be mistaken for a "6" instead of an "8", unless you look closely.

Both of my original 1967 small block PCV hose clamps have survived, they are noticeably larger than the fuel hose clamps, but I have manual brakes, so I have no power brake booster hose clamps for comparison. My PCV hose clamps have a rounded center tang, with two squared-off outer tangs that are slightly rounded or radiused on the inboard side of the tang only. Both PCV hose clamps are black and stamped "D" on the outside of the band.

The fuel hose clamp called out in the 1967 AIM is GM 3786276 (UPC 8-B3). This same fuel hose Clamp part number is called out in the 1964-1967 AIMs at the fuel hose location (1963 AIM calls out GM 9414820). The GM 3786276 Clamp is listed in the 1970 Passenger P&A 30M catalog, Gr. 1.166, but no dimensions are given. I have one surviving fuel hose clamp from the '67 small block Corvette. It has a few small patches of what looks like green phospate or green paint, has square tangs (all three tangs), with a "U" inside a diamond stamped into the band. The "free" diameter of this barrel clamp is approximately 9/16" ID.

So if I have understood this correctly, the black PCV hose clamps are the same as the black brake booster hose clamps for 1966-1967, at least according to the AIMs (a different clamp may have been used in practice, I don't know). The 1966 AIM calls out the same hose clamp p/n for both locations (UPC 6-C3 and UPC J50-A3), and I think the '67 AIM does too, under close examination of the handwritten part number.

The fuel hose clamps are a different part number, GM 3786276, and they are darkish-green in color.

[Gary S.]

Re: Power brake hose clamps, what color green?

Pictures of well-known 67 Bowtie cars. Every picture I have of a 67 has black clamps on the PB booster.
PowerBrakeBoosterHose.JPG

CarbsRHPCVIntake.JPG

GasLineIdlerExhaustHeader.JPG

[Tom D.]

Re: Power brake hose clamps, what color green?

Both spring clamp 3786275 and spring clamp 3786276 are discussed above. Service part 3786275 (from the seventies; from a Chevy Dealer) is shown below.

[Michael H.]

Re: Power brake hose clamps, what color green?

Both spring clamp 3786275 and spring clamp 3786276 are discussed above. Service part 3786275 (from the seventies; from a Chevy Dealer) is shown below.

I forgot how confused that discussion had some folks. I hope everyone finally got it. Black for the booster and PCV. Green for the fuel line.

The clamps in your picture are not correct, or the correct part number for either.