thinking when kt comes t o choosrng an intake manifold the key t o this new desrgn rs ... control insert allows you t o control air flow patterns in several different ways ... 1 i t regulates the volume of air flow bv means of t size relatlve tosfh ... size 2 i t controls the v locit yof air flow through the manlfold b t s shape ... 4 i t controls drstribution of fuel and air flow u i iiiiuci uy r aellv lyrts ... pon reg 4 bbl carb 8126 61 27 61 28 ford 289-302reg 4 bbl carb does not have ... rear water crossover ford351 cleveland 4v heads reg 4 bbl carb ford ... 351 cleveland 2y heads reg 4 bbl carb ...