Holley Performance 300-125BK Engine Intake Manifold

Base Plenum Top Mounting Flange Height â€" 8.42†to the lifter valley cover flange on engine block. Total Height with 92/105mm EFI Plenum Top â€" 12.32†to the lifter valley cover flange on engine block. Port Size â€" 2.49†Height x 1.21†Wide Mounting Flange Gasket Type â€" Standard LS3 Molded O-Ring Plenum Top Gasket Type â€" 3/32†Round O-ring Cord Throttle Body Flange Location, with 92/102mm EFI Plenum Top : Height â€" 8.42†(from engine block lifter valley cover flange), Longitudinal Location â€" 3.84†(forward from engine block front flange), Angle â€" 25 deg. (down from vertical) Runner Length â€" 6.29â€, As-Cast Runner Cross-Sectional Area â€" Tapered 4.67 in² to 2.84 in²