Designed in conjunction with noted Ford drag racer Billy Glidden for raised port aluminum C3 SVO (Yates) cylinder heads, #2863 fits 9.2" deck heights. Victor Glidden 351Y #2863 has 3.2 square-inch runners. Both are perfect for all-out nitrous-assisted drag race applications. Carb mount flange and plenum are machined for 4500 Series carbs and require port matching and blending prior to use.