Modular Base Intake Manifold

The Holley GM LS1/LS2/LS6 Modular Hi-Ram Intake Manifold is presented as a budget-friendly alternative to fabricated sheet-metal intakes for high-performance builds where engine bay height is not restrictive. It is engineered to maximize the potential of LS1, LS2, and LS6 style cylinder heads, offering significant gains for both naturally aspirated and forced induction setups. Constructed from cast aluminum, this intake manifold features a runner length of 6.58 inches with a tapered cross-section designed for broad engine performance. The port size is 2.49 inches in height by 1.21 inches in width. EFI fuel rails are included, machined for -8AN O-ring fittings, with ample passages to handle high fuel flows and dampen pressure pulsations. The base plenum top mounting flange is 8.42 inches from the engine block lifter valley cover flange. With a 92mm or 102mm EFI plenum top, the total height reaches 12.32 inches. The throttle body flange location is specified at a height of 8.42 inches, a longitudinal position 3.84 inches forward from the engine block front flange, and an angle of 25 degrees down from vertical. This Hi-Ram intake is intended for naturally aspirated or forced induction engines displacing 6.0 to 7.0+ liters, optimized for peak power production between 7000 and 8000+ RPM. Its aggressive styling and modular design make it a versatile foundation for custom induction systems, appealing to a wide range of applications including drag racing, muscle cars, marine, off-road, sandrails, pulling trucks, track use, and street rods.