1989 Pontiac Trans Am GTA - Third Bird Heard
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Because these headers are also for 305 engines (we have a 350) and use a ball-type collector to Y-pipe seal, the stock 1151/416-inch opening at the collector was a bit small. We used some paint on the inside of the Y-pipe to see where it would seal, and then employed our trusty die grinder to open up the collectors to 2.125-inches (left), still leaving plenty of meat for a good seal. View Related Article
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