Overview Got an LS engine to get running? Nothing is easier than bolting on a carburetor. Holley's dual plane carbureted intake for GM's LS engines will help you get on the streets quick! | Its dual plane design makes it perfect for low end torque, yet it still pulls all the way to 6,500 RPM! Our O-ring cylinder head mounting flange gaskets provide an OEM style seal and make installation a snap. Bolt one on today! Features Minimum carb flange height means it fits in vehicles with minimal or no hood modifications Includes Viton® O-rings - Viton® is a registered trademark of DuPont Performance Elastomers 1500-6500 RPM power band Optimized runner layout and constant cross sectional area provide a broad torque curve Cast aluminum construction and efficient casting design for light weight, consistent wall thicknesses and improved casting quality Weighs 14.56 lbs. Height (rear) - 6.14" from rear lifter valley cover to carb mounting flange Height (front) - 5.07" from front lifter valley cover to carb mounting flange Mounting flange gasket type - O-ring Great for carbureted or throttle body EFI street applications Port size - 2.454" height x 1.09" wide 4150 square bore carb mounting flange