Correct 2" Guillotine exhaust clamp for 69' SB

[Paul O.]

Re: Correct 2" Guillotine exhaust clamp for 69' SB

As Joe stated I have seen the body or ox-bow black finish with black paint and without also in silver and the "C" clamp washer and nut natural and with black finish and silver.

Paul 18046

[Alan S.]

Re: Correct 2" Guillotine exhaust clamp for 69' SB

Hi Paul,
I'm trying to understand your 8:08 pm post.
The body could be "black paint", OR "without" (natural?), OR "also in silver" (plating?).
The C clamp, AND washer, AND nut, could be "natural", OR "with black finish" (black plating, but not paint ?), OR "silver" (plating?)?
Thanks very much!
Regards,
Alan

[Paul O.]

Re: Correct 2" Guillotine exhaust clamp for 69' SB

Sorry for the confusion. I will try to explain.

1. Pipes at transmission with 2" exhaust for all 1969 body or ox-bow the most frequent finish (1)black plated have seen (2)natural and (3)silver but not as frequent. Can also be dipped painted black.
2. The C clamp, washer and nut with black plated body have seen black plated and also natural also could be dip painted black. If body is natural clamp washer nut natural if silver plated all items tend to be plated.
3. The clamp assembly at the muffler hanger and tip always seemed to be black plated due to the muffler blackout I think may also be dip painted. Have seen natural but less frequently even less silver plated.

After 1969 the dipped black paint seemed to disappear but the black plating continued all the way to 1972 as the most frequent example of finish intermixed with natural and silver on some cars. You have to remember we have seen just a small segment of all the cars ever built with their original exhaust systems still intact and most of those dare I say had some sort of adjustments made to them over it life.

Paul 18046

[Alan S.]

Re: Correct 2" Guillotine exhaust clamp for 69' SB

Hi Paul,
Thank you!
Regards,
Alan

[Joseph H.]

Re: Correct 2" Guillotine exhaust clamp for 69' SB

I thought I would open this back up again. The clamps that Zip sells EX569 are the open type exhaust tip clamps. The JG indicates that the front exhaust clamp to the closed style, I assume meaning guillotine.
I think we agree on this.
I still cannot find the correct 2" closed style clamp. Some vendors have this 2" clamp, but not with the flattenedsection on the U, plus some of them are Stainless.
Anyone found the correct typical factory type clamps?
Thanks.

[David L.]

Re: Correct 2" Guillotine exhaust clamp for 69' SB

Back in the 1980's I bought 6 NOS 2 1/2" guillotine clamps and 4 NOS 2" guillotine clamps at a swap meet.

The 2 1/2" extra heavy duty clamps in green boxes are 3/8" with "Reinforced 12 Guage Steel Saddle with Reinforced Rib" and are made by Versatube Corp. of Troy, MI 48084. The tread length measure 1 11/16".

The 2" "LEAK-TITE" clamps (part # C200 and 8605) are 5/16". The blue & white boxes are all stamped "10-01276-5" on one of the flaps. Two of the four boxes have Dec. 1980 date codes. The guillotine part is stamped with an encircled "2" and the end part is stamped "2". The thread length measures 1 3/8"

Dave

[Paul O.]

Re: Correct 2" Guillotine exhaust clamp for 69' SB

Here is a photo of a closed 2" clamp101_1846.jpg

[David L.]

Re: Correct 2" Guillotine exhaust clamp for 69' SB

I found 2 more NOS 2" guillotine clamps in my collection but not in boxes. These clamps are identical to my other 2" guillotine clamps except that they are stamped "PAT. NO. 2719345". Patent # 2719345 was issued Oct. 4, 1955.

Dave

[Joe L.]

Re: Correct 2" Guillotine exhaust clamp for 69' SB

Here is a photo of a closed 2" clamp[ATTACH=CONFIG]39729[/ATTACH]

Paul------


There are multiple definitions of the term "closed" as it applies to exhaust pipe clamps. Under the GM definition, what we often refer to as "guillotine" clamps GM refers to as "enclosed" or "closed" type. GM refers to the other popular style clamp with a "u-channel" design as "open". Under the GM definition, the clamp shown in your photo is an "open" type even though it has "tabs" which enclose the ends.

[David L.]

Re: Correct 2" Guillotine exhaust clamp for 69' SB

My 1969 Corvette Parts Catalog (Oct. 1969) shows both the "OPEN" and "ENCLOSED" type clamps. The 3952741 U-bolt is listed for the 69 Corvette (exc. side mtd. exh.) in Gr. 3.708. As Joe stated previously the 3848157 clamp was not serviced. The 3853723 clamp is listed for the 69 Corvette (exc. T.H. 400, side mtd. exh.).

Dave

[Paul O.]

Re: Correct 2" Guillotine exhaust clamp for 69' SB

It's a good day learned something. Always thought "guillotine" meant single blade and closed was boxed thanks guys.

[David L.]

Re: Correct 2" Guillotine exhaust clamp for 69' SB

Scott has some NOS GM 3754883 2" guillotine clamps (stamped "GM 3754883", "PAT. NO. 2719345", and the encircled "2") as shown in the link below that appear to be made by the same manufacturer as my 2" guillotine except my clamps do not have the GM part number. GM 3754883 is a service part number for a complete clamp assembly (u-bolt, clamp, washer, and nut).

Dave

https://www.forums.ncrs.org/showthre...ghlight=102634

[Joseph H.]

Re: Correct 2" Guillotine exhaust clamp for 69' SB

I keep checking back and see more good info posted. also see some good pics of the closed style clamps. Is the rounded U part of the clamp supposed to be flattened? Thanks for the info. Also still trying to find where to buy correct clamps.

[Joe L.]

Re: Correct 2" Guillotine exhaust clamp for 69' SB

. Is the rounded U part of the clamp supposed to be flattened?

Joseph------


With respect to original clamps, yes.

[David L.]

Re: Correct 2" Guillotine exhaust clamp for 69' SB

Pictured below is a NOS 3" U-bolt with a "flattened rounded U part" that I bought from my local Chev. dealer many years ago. I do not remember the part number. There is a raised letter "W" on the flattened part. I have never seen a 2", 2 1/4", or 2 1/2" U-bolt like this one.

Dave