![]() Lower gears help you get the best of the carb. ![]() ![]() They click well with manual transmission. This means several things: They work better with lighter vehicles. Unlike Holley parts, Edelbrock carbs come with mechanical secondaries. Ford then switched to a ported source in the 1970's for emissions purposes. From what I can tell the early 302's (like in 1968) used the manifold as the vacuum advance source, right from the factory. If the intake manifold is the source, when you open the throttle you'd get less advance at throttle openings. In addition, there is a weirdly shaped hole in the middle on each side that allows exhaust to flow under the manifold, heating the plenum, which helps gasoline atomize (especially in cold weather) but hurts performance a little.
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