Holley/MSD released its Single Plane Split-Design Race Intake Manifolds, which have been developed specifically for high-performance and race Gen III LS engines with cathedral port heads and 4150-style square-bore flanged carburetors or throttle bodies. Their special two-piece split configuration allows easy disassembly for direct access to internal plenum and port surfaces and makes custom porting and matching a snap. Lighter and less than half the price of other split race manifolds, Holley Single Plane Split-Design Race Intake Manifolds are ideal for 5.3L to 6.2L+ displacement applications and rock-solid up to 7000 rpm. The single-plane design provides extra hood clearance and optimal performance across the entire RPM band, and captured O-ring seals at the split and all eight head ports make reassembly simple and precise.