C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Weird wooping engine noise

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Old Aug 24, 2025 | 08:09 PM
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Alex With a Dream's Avatar
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From: Newnan, GA
Default Weird wooping engine noise

Hey guys my 1988 c4 corvette is making a really weird wooping noise from the engine. I am unsure as to where is coming fromIMG_2449.mov I attached a video on the noise. Just some background, car hasn’t started in a long time and I just put a rebuilt transmission into the car. Car starts and has line pressure but noise starts when the car reaches about 120 degrees. The noise is definitely coming from the front of the engine but we are not sure what it’s coming from. I am pretty new to cars so any help would be amazing! The car is also just currently running out the headers with no exhaust.
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