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B Model Mack restoration

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E6 300 4Valve need more speed.

Have 1985 R688ST with a e6 300 and a T2090 trans, also has 4.64 reas. Has fuel turned up and pulls excellent at 1600 rpm, no complaints there . But my issue now is I can't get this truck to go more than 65 mph?? Any thoughts, ideas, or anything that may help me squeeze another 5 mph out of this thing now. Thank you



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