Holley Intake Manifold LT Modular Hi-Ram Lower Base Only Tunnel Ram 300-237

The design of Holley Hi-Ram GM LT1 lower manifolds allows for easy disassembly to do custom porting, use multiple tops, or create custom induction systems. Each runner has a large radius where it meets the plenum, as well as an optimized taper and cross-sectional area to perform in a wide variety of engine configurations. The bases are available with or without port EFI provisions. Looking for the ultimate performance? Begin with Holley LT Modular Hi-Ram lower intake manifolds. Features include: * Modular design with removable top * Overall height: 13.34 in. with EFI top (95mm or 105mm) * Overall height: 12.10 in. with carb-style top (2 x 4150 or 2 x 4500) * Height at plenum flange: 9.44 in. * Port size: 2.06 in. high x 1.53 in. wide * Runner length: approximately 6.5 in. * Large plenum volume of 549 cubic in. with 1 x 95mm or 1 x 105mm throttle body top * Available with or without injector ports in the runners * Intakes with injector ports include fuel rails with dual mounting (1.48 in. or 2.56 in. O-ring to O-ring injector length * Anodized fuel rails, laser-etched and machined for -8 AN O-ring fittings * Rear of plenum machined for MAP and three vacuum ports * Head flange has clearance for fuel supply to high pressure pump * Increased runner wall thickness for custom porting at the plenum-to-runner entry on each runner * O-ring seals at cylinder heads and plenum top * Top-mounted screws on plenum top (all except front two screws) * Available top options: 1 x 95mm, 1 x 105mm, 2 x 4150, 2 x 4500, or blank flange for custom throttle bodies (all sold separately) * 3500-8000+ rpm power band