How To Size Headers Pipe Test Chart
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Here are some dyno test results of four different primary tube lengths on an 8.5:1 compression 350 Chevy. The shortest length at 18 inches (black curves) show the engine did not like really short primaries. But the 29-inch (green), the 32-inch (red) and the 38-inch (blue) headers all performed well with only a moderate bias toward better low end from the longer pipes. View Related Article
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