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03-31-2025, 01:12 PM
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#1 |
   
Drives: 2013 zl1 vert Join Date: Dec 2018
Location: Rochester, New york
Posts: 1,202
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Head swap now popping from exhaust
I just completed my cnc head swap and now I’m getting a loud pop from the exhaust. Can’t figure out what’s going on. No cel, new plugs, can’t find a vacuum leak, injectors are firing, no strange noise. It’s only when idling. When i put a light load it goes away. Has anyone experienced this?
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22% lower/ 2.5 upper/ 2” headers/ cat delete/ x-pipe/ 2 gallon x tank/ 100-3 pump/ fic 1300/ dsx aux kit/ 103mm throttle body/ big gulp 5” intake/ meth kit/ prometh lid injection/FI interchiller/ 160* stat/ ngk-7/ msd wires/ elite catch can/ tsp cam/ Che trunnions/ ported supercharger/ 1/2” lid spacer/ cnc,milled ported heads/ brick mod/BMR toe and trailing arms/ 781hp 748 tq SAE @17.3lb on a loaded dyno.
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04-01-2025, 12:12 AM
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#2 |
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Drives: ZL1 Join Date: Oct 2012
Location: Talladega
Posts: 651
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Sounds like you might possibly have an exhaust leak or an exhaust valve leak, hopefully it's not the latter.
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04-01-2025, 06:01 AM
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#3 | |
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Drives: 2013 zl1 vert Join Date: Dec 2018
Location: Rochester, New york
Posts: 1,202
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Quote:
__________________
22% lower/ 2.5 upper/ 2” headers/ cat delete/ x-pipe/ 2 gallon x tank/ 100-3 pump/ fic 1300/ dsx aux kit/ 103mm throttle body/ big gulp 5” intake/ meth kit/ prometh lid injection/FI interchiller/ 160* stat/ ngk-7/ msd wires/ elite catch can/ tsp cam/ Che trunnions/ ported supercharger/ 1/2” lid spacer/ cnc,milled ported heads/ brick mod/BMR toe and trailing arms/ 781hp 748 tq SAE @17.3lb on a loaded dyno.
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04-01-2025, 02:01 PM
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#4 |
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Drives: ZL1 Join Date: Oct 2012
Location: Talladega
Posts: 651
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Awesome, I am happy you found the issue and was not anything worse.
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04-01-2025, 03:56 PM
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#5 | |
  Drives: ZL1, 2013, tri-coat-red, manual Join Date: Nov 2013
Location: Michigan
Posts: 1,665
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Quote:
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04-01-2025, 04:04 PM
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#6 | |
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Drives: 2013 zl1 vert Join Date: Dec 2018
Location: Rochester, New york
Posts: 1,202
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Quote:
__________________
22% lower/ 2.5 upper/ 2” headers/ cat delete/ x-pipe/ 2 gallon x tank/ 100-3 pump/ fic 1300/ dsx aux kit/ 103mm throttle body/ big gulp 5” intake/ meth kit/ prometh lid injection/FI interchiller/ 160* stat/ ngk-7/ msd wires/ elite catch can/ tsp cam/ Che trunnions/ ported supercharger/ 1/2” lid spacer/ cnc,milled ported heads/ brick mod/BMR toe and trailing arms/ 781hp 748 tq SAE @17.3lb on a loaded dyno.
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04-01-2025, 05:01 PM
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#7 | |
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Drives: ZL1, 2013, tri-coat-red, manual Join Date: Nov 2013
Location: Michigan
Posts: 1,665
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Quote:
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04-01-2025, 05:24 PM
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#8 |
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Drives: 2013 zl1 vert Join Date: Dec 2018
Location: Rochester, New york
Posts: 1,202
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I’ll tell you what tho. The popping scared the crap out of me. I was like what did i F up.
__________________
22% lower/ 2.5 upper/ 2” headers/ cat delete/ x-pipe/ 2 gallon x tank/ 100-3 pump/ fic 1300/ dsx aux kit/ 103mm throttle body/ big gulp 5” intake/ meth kit/ prometh lid injection/FI interchiller/ 160* stat/ ngk-7/ msd wires/ elite catch can/ tsp cam/ Che trunnions/ ported supercharger/ 1/2” lid spacer/ cnc,milled ported heads/ brick mod/BMR toe and trailing arms/ 781hp 748 tq SAE @17.3lb on a loaded dyno.
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