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07-30-2025, 04:18 PM
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#71 |
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fo'shizZL1
Drives: 2017 ZL1 Join Date: Aug 2017
Location: ATL
Posts: 1,849
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Have those been fully welded on the ID/other side of the flange, perhaps? A lot of header manufacturers will spot or stitch the outside of the flange and then all-around weld the interior. Likely for dimensional/positional accuracy of the primary tube locations, then a sealing weld on the inside, to prevent the tubes from moving when heated.
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2017 ZL1 M6 Black | Maggie 2650 // 103TB // Big Gulp // CSP LT's & Ultra Cats // BMR MM // BC Forged KL13
Mods being installed- oil pump, cam, ported heads, dual in-tank, Goliath and XDI, corn, etc., etc. |
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07-30-2025, 04:53 PM
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#72 |
          
Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 4,195
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Yes, sorry for not posting these two pics earlier. We're having them welded on the outside of the joint. They're five years old and have been subjected to many extreme heat cycles.
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2020 ZL1LE A10.
LME LT4 390 short block, LME CID Heads, Kong E2650, FBO. 15" conversion, MT ET Street R 325/15. 100 octane: 1045hp/1055tq. 100 octane + Meth (1x10+): 1117 hp/1067 tq |
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07-30-2025, 05:40 PM
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#73 |
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fo'shizZL1
Drives: 2017 ZL1 Join Date: Aug 2017
Location: ATL
Posts: 1,849
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That looks like the weld didn't get much penetration into the tube to begin with. Looks like it just laid over it. A little hard to tell, but that's what it looks like.
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2017 ZL1 M6 Black | Maggie 2650 // 103TB // Big Gulp // CSP LT's & Ultra Cats // BMR MM // BC Forged KL13
Mods being installed- oil pump, cam, ported heads, dual in-tank, Goliath and XDI, corn, etc., etc. |
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07-31-2025, 08:15 AM
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#74 |
 
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 7,666
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That was likely causing issues with afr reporting.
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 2016 NFG SS A8/Whipple 2.9/Fuel System/Flex Fuel |
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07-31-2025, 10:30 AM
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#75 | |
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Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 4,195
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Quote:
__________________
2020 ZL1LE A10.
LME LT4 390 short block, LME CID Heads, Kong E2650, FBO. 15" conversion, MT ET Street R 325/15. 100 octane: 1045hp/1055tq. 100 octane + Meth (1x10+): 1117 hp/1067 tq |
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08-11-2025, 12:10 PM
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#76 |
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Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 4,195
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headers have been welded and ceramic coated
__________________
2020 ZL1LE A10.
LME LT4 390 short block, LME CID Heads, Kong E2650, FBO. 15" conversion, MT ET Street R 325/15. 100 octane: 1045hp/1055tq. 100 octane + Meth (1x10+): 1117 hp/1067 tq |
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