1970 exhaust clamps

[D S.]

While at the Frisco NCRS meet I began looking at exhsust clamps on the exhaust tips. I saw three different styles, one of which had the numbers 2171 stamped on them. The illustrations in the 1970-1972 JG weren't the same so I looked in the AIM on UPC 8-Sheets A2 and A3. Although the ones at the transmission and the ones at the exhaust tips appeared to be configured alike they had two different part numbers. For some reason the guillotine style seems to be the accepted standard for 1970-1972. The AIM part number for the exhaust tip clamps is 3982171 which agrees in style with the ones I bought in Frisco. The clamps at the transmission part numbers are 3848157. Who sells the ones at the transmission that will pass judging standards?
When I looked at my over 20 year old exhaust system where it passes through the crossmember there are four clamps there because there are two transition pipes that pass through the crossmember instead of two long pipes that meet up with the header pipes. Looks factory.

Thanks,
Scott Sims
Texas Chapter

[Joe L.]

Re: 1970 exhaust clamps

When I looked at my over 20 year old exhaust system where it passes through the crossmember there are four clamps there because there are two transition pipes that pass through the crossmember instead of two long pipes that meet up with the header pipes. Looks factory.

Thanks,
Scott Sims
Texas Chapter

Scott-----


I don't know what you mean by "transition pipes". However, at the transmission crossmember the forward pipe should fit into a bell (slip) joint in the rear pipe. There should be one guillotine style clamp on each side which both clamps the pipes together and fastens the pipes to the "oxbow" bracket. I've never seen more than 1 clamp on either side and, curiously, that's exactly what is shown in the AIM.

[D S.]

Re: 1970 exhaust clamps

Joe, there are the two header pipes that meet with two pipes approximately two feet long. Those two 2-foot pipes pass through the oxbow and then meet up with the muffler pipes. Two clamps are fore of the oxbow and two clamps are aft. Not that it should matter but my car is an LS-5.

if guillotine clamps which ones should I purchase? Would they have a W stamp on the flattened straps?

[D S.]

Re: 1970 exhaust clamps

Oxbow Exhaust clamps.jpg

Correction on pipe lengths through the oxbow. Guy thing. They appear to be one foot long or less. See photo.

[Joe L.]

Re: 1970 exhaust clamps

Joe, there are the two header pipes that meet with two pipes approximately two feet long. Those two 2-foot pipes pass through the oxbow and then meet up with the muffler pipes. Two clamps are fore of the oxbow and two clamps are aft. Not that it should matter but my car is an LS-5.

if guillotine clamps which ones should I purchase? Would they have a W stamp on the flattened straps?

Scott-----

I have never seen or heard of an original exhaust pipe configuration which you describe.

As far as I know, original guillotine clamps had the flattened u-bolts. However, I can't say that all did. I believe there may have been some variability in the clamps used.

[Joe L.]

Re: 1970 exhaust clamps

[ATTACH=CONFIG]42329[/ATTACH]

Correction on pipe lengths through the oxbow. Guy thing. They appear to be one foot long or less. See photo.

Scott-----


The image loads in such a small size that it's hard for me to make out much. However, from what I can generally see, I repeat what I said before----I've never seen or heard of this configuration in an original installation.

[Terry M.]

Re: 1970 exhaust clamps

[ATTACH=CONFIG]42329[/ATTACH]

Correction on pipe lengths through the oxbow. Guy thing. They appear to be one foot long or less. See photo.

Like Joe, that image is hard for me to see, but it looks not TFP to me.

[Bob J.]

Re: 1970 exhaust clamps

Like Joe, that image is hard for me to see, but it looks not TFP to me.

Agree with Terry, I think the clamp behind the "oxbow" is the not TFP clamp.

[D S.]

Re: 1970 exhaust clamps

Agree with Terry, I think the clamp behind the "oxbow" is the not TFP clamp.

I'm thinking that it's time to replace the exhaust system anyway but nothing exotically priced. What do y'all recommend?

[Joe L.]

Re: 1970 exhaust clamps

I'm thinking that it's time to replace the exhaust system anyway but nothing exotically priced. What do y'all recommend?

Scott-----


Based on your parameters, I think your best bet would be a Corvette Central or Allen's aluminized system

[Alan S.]

Re: 1970 exhaust clamps

Hi Scott,
I was very pleased with the 2" welded aluminized system I bought from CC for my 71 sb.
It fit well and it was easy to install with the car on jack stands and blocks.
The price is good and they often have special deals on the shipping in addition.
It even sounds like I remember the original did... MANY years ago.
Regards,
Alan

[D S.]

Re: 1970 exhaust clamps

I don't want something that sounds like a wimpish 4-cylinder nor do I want something that is outlandishly loud. I like the deep, throaty rumble of the big block that it is. What came stock on it?

[R N.]

Re: 1970 exhaust clamps

I don't want something that sounds like a wimpish 4-cylinder nor do I want something that is outlandishly loud. I like the deep, throaty rumble of the big block that it is. What came stock on it?

Hi Scott,
My friend replaced the exhaust system on his '72 with the CC system. It was too quiet for his liking and mine. I believe you can buy the CC welded system with the N11 off-road mufflers which would give you the sound you are looking for.

The fit from CC is excellent with no issues. If you sign-up to CC mailing list they do have free shipping offers (Including exhaust systems) 3-4 times a year.

[Bill C.]

Re: 1970 exhaust clamps

Scott,

Get the system from Eric Gardner ..
By far the closet to a factory bigblock system. Has the flats and crinkle bends pretty darn close.
Plus - I heard one of their systems and it sounded very very close to a factory sound.

I spent a PILE of $$$$ piecing a NOS system for my old 72 - and lots of folks who were around in the 70's said it sounded like what they remembered.
It had all the double walled pipe and 385/386 W mufflers.
This is what I used for a sound comparison.

I have an audio file I made of the car if you would like to hear the system.




Bill

[Mike E.]

Re: 1970 exhaust clamps

For old time's sake--my 30k mile 71 LT-1 had the exhaust removed the first couple of weeks, and I reinstalled it about 8 years ago. The original sound is unique, and to my ear, not duplicated. Anyone who wants to can come around (May-Nov) when it won't pull in too much moisture, and revel in the sound!