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Re: Offy "Dual-Port" intake manifold
Cody,
You probably had small valve heads and a stock cam. A 400 is known to knock down excellent mileage when at a mild level of tune and a good tune-up. The Q-Jet would have more to do with the efficiency than the intake, but the high velocity of the primary runners COULD be responsible. But as you learned, it's a POS when it comes to making any power. The factory intake is still among the better choices.
Jim
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