Correct 2" Guillotine exhaust clamp for 69' SB

[Joseph H.]

I am looking for the most correct 2" clamp to secure the front exhaust pipes to the rear pipes
on a 69' small block. I see paragon sells the 2 1/2" version, but not the typical factory configuration
clamp for a 2" SB exhaust.
Anyone know where to purchase?
Thanks,
Joe

[Alan S.]

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

Hi Joseph,
I believe ZIP has a 2" guillotine clamp that is reasonably close to the original. EX569
Have you seen that one?
Regards,
Alan

[Joseph H.]

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

Thanks, yes that looks like what I need.
Joe

[Jeffrey S.]

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

Joseph, Alan,
If I'm not mistaken these are the clamps that fasten the exhaust tips to the muffler not the center pipe clamps. These are not what is referred to as "guillotine" style. Those clamps have 2 formed "tubes" that the threaded ends feed through. They are stamped steel (not stainless). I was not able to find any for sale by a supplier and I found ones for my '69 at a swap meet. If I can get a picture later today I will post.
Jeff

[Dave S.]

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

Joseph, Alan,
If I'm not mistaken these are the clamps that fasten the exhaust tips to the muffler not the center pipe clamps. These are not what is referred to as "guillotine" style. Those clamps have 2 formed "tubes" that the threaded ends feed through. They are stamped steel (not stainless). I was not able to find any for sale by a supplier and I found ones for my '69 at a swap meet. If I can get a picture later today I will post.
Jeff

Joseph,
I believe the attached photo shows the type of guillotine clamp you need. This is a 2 1/2' clamp from an original LT-1 exhaust system but I believe the 2" are the same appearing. The top of the U shape is flattened as I recall.

[Alan S.]

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

Hi Joe, Jeff, Dave,
I believe the # I gave is for the 'guillotine' type clamp for use at the pipe connection, not at the muffler/tip connection. The descriptions and pictures in the catalogues need to be looked at carefully to be sure you order the 2 different style of clamps in the right size.
The 2" clamps that ZIP is selling for use at the center exhaust pipe bracket is 'quite' similar to the 2 1/2" clamp in Dave's photo.
The difference I can see is that the horizontal reinforcing, (?), 'rib' in the body of Dave's 2 1/2" clamp is missing on the 2" clamp from ZIP. Was it on the original 2" clamp
Regards,
Alan

[Joe L.]

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

I am looking for the most correct 2" clamp to secure the front exhaust pipes to the rear pipes
on a 69' small block. I see paragon sells the 2 1/2" version, but not the typical factory configuration
clamp for a 2" SB exhaust.
Anyone know where to purchase?
Thanks,
Joe

Joe------


According to GM, the same u-bolt and clamp were used for the crossmember pipe connection and the exhaust tip connection to the muffler. On my original owner 1969 the crossmember clamps were the "guillotine" style clamp (actually, this type clamp is called an ENCLOSED CLAMP). However, if I recall correctly, the original clamps for the exhaust tips were of the OPEN type. I do not recall, for sure, though.

The u-bolts were GM #3952741 and these were once available in SERVICE. However, they were discontinued without supercession in July, 1987.

The clamp component was GM #3848157 and was never available in SERVICE. It's possible that it was available as part of some clamp UNIT( i.e. u-bolt+clamp), but I don't know which one.

These u-bolts and clamps were supplied by multiple suppliers to GM and were likely being used by the millions across all the GM car and truck lines. I expect that there were variations in configuration even between clamps and u-bolts of the same part number.

[Jeffrey S.]

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

Alan,
I went to the Zip website and enteren "EX569" in the search box and got the clamp for the exhaust tips as I have on my '69. It is the open style as Joe described above. The clamp pictured is the same as I have at that location which is different than the open style. Maybe I did something wrong in my search at Zip.
Jeff

[Alan S.]

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

Hi Jeff,
I certainly could be mistaken about the names or applications.
I've been thinking the guillotine type has one blade while the box type has two.
Here are 2 pictures to show type, not accuracy.
Regards,
Alan

Guillotine


Box

[Patrick H.]

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

Box

Alan,

I believe that the threads from that clamp usually face inboard.

Patrick

[Joseph H.]

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

Thanks for the info guys. When I go to the ZIP website EX569 comes up as the unclosed clamp that Alan and Dave show on the front pipes.
I guess as a follow on the JG for 69' indicates the clamps were black dip painted, any comments on that?
Joe

[Paul O.]

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

Joe

I can tell you both "C" clamp, body the washers and nuts tended to be black, silver and natural finishes. But they lived in a terrible environment all parts tended to rust rather fast from the heat and cooling cycles. Most times the the original finishes are not there any more especially at the trans mount so my gut feeling would be toward black plated finish may (not as common) also be dip painted black the black plated finish is more common then natural or silver. But I would accept any of the above finishes for judging.

Paul 18046

[Gene M.]

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

Just to add more confusion to this thread: Should not the threads on the "U" bolt be a fine thread 5/16" as in the earlier cars? Previous photos above look to be 3/8"-16 threads. In fact most available clamps are 3/8"-16 threads. Not being into the c3's for quite a number of years I was wondering.

[Terry M.]

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

Thanks for the info guys. When I go to the ZIP website EX569 comes up as the unclosed clamp that Alan and Dave show on the front pipes.
I guess as a follow on the JG for 69' indicates the clamps were black dip painted, any comments on that?
Joe

Please share with us what the 1968-69 JG says that would lead you to that conclusion. Please cite the page number.

[Joe L.]

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

Thanks for the info guys. When I go to the ZIP website EX569 comes up as the unclosed clamp that Alan and Dave show on the front pipes.
I guess as a follow on the JG for 69' indicates the clamps were black dip painted, any comments on that?
Joe

Joe-----


GM refers to what we generally call the "ox-bow bracket as a CLAMP. That piece was always dip painted semi gloss black. The u-bolt clamps that I have seen at that location have always been NATURAL steel finish.