Mid-year exhaust tips for underbody exhaust

[Gary B.]

Has anyone had their car judged with the latest version of exhaust tips sold by Long Island Corvette?

In the LIC catalog they list two different part numbers for what seems to be the same item: 33-40 and 07-01. Does anyone know the difference? The descriptions sound identical to me, but I think there must be a reason why they have two different part numbers.

Thanks,

Gary

[Edward J.]

Re: Mid-year exhaust tips for underbody exhaust

Gary, the only real difference is the overall thickness of the Long islands. there pretty close. and think they'll judge just fine. At our regional this weekend I was helping out judging 63 chassis's we did 6 cars and 4 of the 5 of the 6 cars had seams, one with part no.s so that was a deduct.

Nor sure on the L.I. part no.s difference's.

[Perry M.]

Re: Mid-year exhaust tips for underbody exhaust

One is magnetic and the other is not.

[Kim C.]

Re: Mid-year exhaust tips for underbody exhaust

#07-01 = #33-40 2 part #'s for 2 different sections in the catalog - same part = with seam , magnetic , no part#

[Alan D.]

Re: Mid-year exhaust tips for underbody exhaust

= with seam , magnetic , no part# and that's the one you want.

[Gary B.]

Re: Mid-year exhaust tips for underbody exhaust

#07-01 = #33-40 2 part #'s for 2 different sections in the catalog - same part = with seam , magnetic , no part#

Thanks Kim.

Gary

[Greg T.]

Re: Mid-year exhaust tips for underbody exhaust

I believe the LIC weld seam goes down the center of the tailpipe on the bottom. The originals are offset to one side.

[Alan D.]

Re: Mid-year exhaust tips for underbody exhaust

GM had a drawing on these in which a specification of 30 degrees +/- 1 degree from bottom center. The bottom center has been a judging standard that occurred over the years.
Normally I would need to show the print not to get a deduct! At last event (2013) judges were looking for center however Knew it was not always at center and I never needed to show print, things seem to be getting better. (PS also liked lack of part #)

[Gary B.]

Re: Mid-year exhaust tips for underbody exhaust

GM had a drawing on these in which a specification of 30 degrees +/- 1 degree from bottom center. The bottom center has been a judging standard that occurred over the years.
Normally I would need to show the print not to get a deduct! At last event (2013) judges were looking for center however Knew it was not always at center and I never needed to show print, things seem to be getting better. (PS also liked lack of part #)

[Alan D.]

Re: Mid-year exhaust tips for underbody exhaust

Gary, the print shows the seam at 7:00 (30 deg) looking at rear of pipe (the cut end) with a spec of +/-1 deg (29-31 deg)
Now we know more than one manufacture was typically used so . . . I have some replacement tips used in late 60's with GM part number and one has seam at 6:00 (center) and the other is at 5:30. So these are not repo's but service parts - how did that happen?? Do not think a Judge should get toooo detailed here!
Now I know Harry Sadlock has some original 63 tips, he could let us know where the seam is but aren't they different for 63??

[Wayne M.]

Re: Mid-year exhaust tips for underbody exhaust

Here's a set of used tips I got off eBay, about 5 years ago. On the inside surface of one, there's an etched or painted number 866_?_44, which was probably the stock sheet identifier prior to forming the tube. These seams are definitely not as AD's print shows. If zero degrees is the bottom, then these are 80 deg. and 95 deg counter-clockwise from that datum. There is no visible seam from the outside; would polishing eliminate evidence of the seam ? They are not even the slightest bit magnetic. No stamped numbers that I can see.

Where are these numbers usually found ?

[Alan D.]

Re: Mid-year exhaust tips for underbody exhaust

Here is the GM pn, typical location. My understanding (could be wrong here) is that production parts did not have a part number on them. So you may have some original one's! And yes the buffing would remove the seam. It now appears to me that a lot of production parts did not have a part numbers however know some did.
From some of the latest comments of the ex-workers, service replacements were required to have a GM part number. Think we have seen that example on the N11 exhaust recently.

As for the location of the seam I suspect (always dangerous to do) as long as it did not stand out the parts were accepted and used. GM was building cars not Space Modules, so we can not get to anal here.

[John D.]

Re: Mid-year exhaust tips for underbody exhaust

The originals on my 63 have the seam at 6:00. I had them restored by a friend of mine as all of the service replacement I had stashed over the years from Chevy were incorrect.

[Gary B.]

Re: Mid-year exhaust tips for underbody exhaust

Gary, the print shows the seam at 7:00 (30 deg) looking at rear of pipe (the cut end) with a spec of +/-1 deg (29-31 deg)
...

Alan,

Do you think GM didn't want the seam to be placed at 6 o'clock position because if it had been there any moisture that collected at the bottom of the tube would interact with the heat-affected-zone of the weld?

Gary

[Gene M.]

Re: Mid-year exhaust tips for underbody exhaust

Alan,

Do you think GM didn't want the seam to be placed at 6 o'clock position because if it had been there any moisture that collected at the bottom of the tube would interact with the heat-affected-zone of the weld?

Gary

No, I would assume GM just wanted the seam to be not visible as one looked at the rear of the car. Nothing more than that.