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13 Mid-1966 marked the arrival of Ford's first Holley flanged dual quad small block intake, which the Blue Thunder is modeled after. This particular catalog entry claims a 40-50 horsepower gain, while others we viewed mentioned 30-35 horsepower for the same combination. Most of these ads were vague as to what the dual quads were being compared to--stock two-barrel or four-barrel? The Shelby parts catalog picked up the Trans-Am intake beginning in 1968, touting its superiority over the original Holley flanged two-4, and promoting use beyond its road race origins. View Related Article
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