Holley Ls1/Ls2/Ls6 Single Plane Carbureted Intake Manifold

Single-plane carbureted intake manifold designed for all GM LS Gen III or IV engines equipped with LS1/LS2/LS6 style cathedral port cylinder heads. Key Features:

• 2500-7000 RPM power band


• 4150 Square bore carb mounting flange (accommodates up to 1.75" diameter throttle bores)


• Optimized runner layout and constant cross-sectional area for a broad torque curve, ensuring optimal vehicle performance from 2500-7000 RPM


• Minimum carb flange height allows for easy fitting in vehicles with minimal hood modifications


• Cast aluminum construction, making it an excellent manifold for centrifugal blower, turbocharged, or NOS power adder applications


• Efficient casting design for a lightweight build, consistent wall thicknesses, and improved casting quality


• Weighs 11.5 lbs.


• Height (front) - 4.95" to the lifter valley cover flange at the engine block front flange


• Port size - 2.659" height x .918" wide


• Includes Viton® intake to cylinder head O-ring gaskets - Viton® is a registered trademark of DuPont Performance Elastomers