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Old 02-05-2014, 12:55 PM   #2
Apex Motorsports
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Drives: 2000 Camaro SS
Join Date: Feb 2010
Location: Louisville, Ky.
Posts: 25,198
The VMAX ported throttle bodies are stock GM throttle bodies that have had a porting service performed. The throttle body itself is a GM part. That spot is where the molten aluminum is poured into the cast when it is manufactured. Some are a little cleaner than others but they all have some sort of marking in that spot.
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