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We installed the 306 on the engine dyno using a set of 1-3/4-inch, full-length Hooker headers. Both motors were run without mufflers or any type of tailpipe but with an 18-inch-long, 3-inch-diameter extension attached to each header collector. The collector extensions offered an increase in low-speed torque production compared to running the open header without restricting the exhaust flow. View Related Article
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