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Published on Mar 12, 2010
The claim is that a header on your straight six will gain 20-40% HP and/or torque. In this case, it's definitely true. (I'll get some road dyno footage later, but for now you'll just have to take my word for it.) The carbs initially improved the big end, and it would keep pulling strong as fast as you wanted to turn it. (That's ok if you feel like grenading the engine) There was also hill climbing inprovement due to the larger CFM being able to pack more fuel charge into the cylinder. Ran it with straight pipes off the header for the 8 miles from the farm to the muffler shop. Wide open throttle performance was non-existent. Fell flat on its face. Once the rest of the exhaust system was in place, it was like a completely different engine. Was able to pull the "test grade" without losing any speed, where it used to drop about 7 MPH. Our other "test grade" is "Hayes Hill Intenational Speedway", a 2 mile hill from mile post 14 to 16 on Hwy 199 in Oregon. Went from dropping to 3rd at MP 15 to about 15.75. Now that's truckin'!