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Stainless Works/hawks LS7 Exhaust System

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Stainless Works/hawks LS7 Exhaust System

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Old 06-14-2018, 08:29 PM
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Stainless Works/hawks LS7 Exhaust System

Always have had trouble with fitment to this day. I'm constantly having to tweak the y-pipe fitment, but I think I've finished that. Now, the pass side collector v-band sometimes vibrates against the frame rail.
I'm going to drop the y-pipe and see if I can heat the frame rail with a propane torch, then hit the frame rail with an air hammer to dimple it enough to give me some additional space. I'm hoping that I don't have to disturb the header (bolts and gasket).

Here are some present fitment pics.
Attached Thumbnails Stainless Works/hawks LS7 Exhaust System-20180613_125342-copy.jpg   Stainless Works/hawks LS7 Exhaust System-20180613_125400-copy.jpg  
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Old 06-14-2018, 08:32 PM
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Re: Stainless Works/hawks LS7 Exhaust System

From the side:
Attached Thumbnails Stainless Works/hawks LS7 Exhaust System-20180613_115312-copy.jpg   Stainless Works/hawks LS7 Exhaust System-20180613_115234-copy.jpg   Stainless Works/hawks LS7 Exhaust System-20180613_115246-copy.jpg   Stainless Works/hawks LS7 Exhaust System-20180613_115359-copy.jpg  
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Old 06-14-2018, 08:34 PM
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Re: Stainless Works/hawks LS7 Exhaust System

I don't need much as seen from this close-up. But you can see how any vibration would be annoying. I'm hoping that I can get in there to dimple while the collector flange is still in position. I'll be doing this in the coming days.



The v-band culprit:
Attached Thumbnails Stainless Works/hawks LS7 Exhaust System-20180613_115341-copy.jpg   Stainless Works/hawks LS7 Exhaust System-20180613_115350-copy.jpg  
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Old 06-14-2018, 08:42 PM
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Re: Stainless Works/hawks LS7 Exhaust System

Ya, I have same problem. Knocks a lot on passenger side at idle and sometimes low RPM cruising.

These headers were developed for an LS7 and I have often wondered if the port position or angle of heads is different enough that the clearance problem goes away. If my LS7 ever makes it into my car then we'll know.
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Old 06-16-2018, 04:26 PM
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Re: Stainless Works/hawks LS7 Exhaust System

OK, dropped the y-pipe section. Here's what it looks like. I'm hoping that I can heat the frame rail enough with a propane torch and dimple the rail (even behind the collector flange) enough to give me 1/3" or so clearance once the v-clamp is back on. As you can see, I don't have to dimple the entire height of the rail, just where the circumference extends (bottom third or so).
Attached Thumbnails Stainless Works/hawks LS7 Exhaust System-20180616_155451-copy.jpg   Stainless Works/hawks LS7 Exhaust System-20180616_155500-copy.jpg   Stainless Works/hawks LS7 Exhaust System-20180616_155515-copy.jpg   Stainless Works/hawks LS7 Exhaust System-20180616_155518-copy.jpg   Stainless Works/hawks LS7 Exhaust System-20180616_155905-copy.jpg  

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Old 06-16-2018, 04:39 PM
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Re: Stainless Works/hawks LS7 Exhaust System

I have a tiny bit of clearance with the V-band in place. I bought some poly engine mounts a while ago hoping that less engine movement would help some. Never got to the job though. Maybe you can tell me so I can sell them if it doesn't.
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Old 06-16-2018, 07:14 PM
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Re: Stainless Works/hawks LS7 Exhaust System

I have the poly mounts in.
Well, as I half expected, the air hammer was a no go. Switched to a #5 hammer and a flat punch. Progress is slow on my back and can't get a good swing with the hammer. This may take a few days as I only want to give an hour or so per day.
Bottom edge of the rail right behind the flange is difficult, but I will win!
Attached Thumbnails Stainless Works/hawks LS7 Exhaust System-20180616_185804-copy.jpg   Stainless Works/hawks LS7 Exhaust System-20180616_185826-copy.jpg  
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Old 06-20-2018, 10:36 AM
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Re: Stainless Works/hawks LS7 Exhaust System

Finished, I can get a pencil all around the clamp.

Patience and strength of will needed to do this with torch and flat punch. Of course, a lift would have made this easier - or doing it before install of the header, BUT I did not have to disturb the header that was the goal.
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Old 06-21-2018, 05:28 AM
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Re: Stainless Works/hawks LS7 Exhaust System

I may have to do the same for my passenger side header...... just drives me nuts when it rattles.

congrats on persevering!
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