21St Century Tri Power 507 Hp Engine Front View
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Bryan and Jeff Gulley tune the 449 between pulls. Through the course of the testing, jetting was richened from No. 68s in the center and end carbs to No. 70s in the center and No. 73s on the end carbs. Bryan also adjusted the timing from the initial setting of 36 degrees to 34 degrees and even tried 32 degrees. The engine liked 34 degrees the best. View Related Article
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