
300-290 Split-Design Race Intake Manifold
Rectangle Port
Engineered with racing and high-performance engines in mind, the featured Split Design allows simple disassembly for easy access to the internal plenum and ports for easier custom port work.
Features
- Designed for maximum performance with a profile for hood clearance
- Fits all GM Gen III, IV LS Engines with rectangle port cylinder heads
- Economical and lighter than the competitors split design intakes
- Split Design provides easy porting
- Captured O-ring seals provide a leak-free seal with the cylinder heads and the intake split
- Uses LS Style MAP Sensor Port
- Includes Intake Mounting Bolts with Washers, (8) O-ring Seals, Billet Fuel Rails with Mounting Hardware
- (2) Different sets of fuel rail brackets are included. The long set will install Bosch EV1 injectors and the short set will install GM OE LS7 injectors. (Supplied injector O-rings in short bracket pack must be changed on LS7 injectors)
Dimensions
- Fits a 4150 square-bore throttle body with up to 1 3/4 in. diameter throttle blades
- Throttle Body Flange Height: 7.200 in. with a 0-degree angle
- Runner Cross-Sectional Area: As-Cast 4.500 in. square at runner entry tapered to 3.200 in. square at flange exit
- Vacuum Ports: (2) 1/8 in. NPT, (1) 1/4 in. NPT, and (1) 3/8 in. NPT at throttle body flange
- Port Size: 2.590 in. Height x 1.280 in. Wide
- Port Flange O-Rings: 0.139 in. Round, Size 2-232, FKM
- Split Flange O-Ring: 0.139 in. Round, 18.500 in. length, FKM
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Intakes Designed with Racing in Mind
Holley Split-Design Race Intake Manifolds incorporate a unique feature typically reserved for high-end, custom racing intakes. These manifolds have a split design that allows the intake to be disassembled into two halves for direct access to the internal ports and plenum. The modular plane design of these intakes can accept either a carburetor or throttle body-mounted electronic fuel injection system. All Holley Split-Design Race Intake Manifolds come complete with mounting hardware, O-ring seals and shoulder bolts that hold both halves together.



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