Downdraft EFI Stack Intake Manifold - Small Block Chevy Fuel Injected
InfoVehicle Info Needed
SPEEDMASTERPART NUMBER: 746-1-148-003

Downdraft EFI Stack Intake Manifold - Small Block Chevy Fuel Injected

$2,45000
ShippingShips on 09/16/2026
Lowest PriceLowest Price Guarantee

GM
Downdraft EFI Stack Intake Manifold
  • Small Block Chevy Fuel Injected
  • Non-EGR
  • Idle-7000 RPM
  • Includes Intake Trumpets and Fuel Rails
  • Aluminum Casting
  • Polished Finish
  • 8-Piece Set

    The Speedmaster Individual throttle body EFI system have all the flash of classic Weber induction but provide higher state of tune and engine performance versatility of EFI. Delivering crisp EFI performance with systems capable of supporting high hp. Fuel and air is delivered through precision cast aluminum 50mm IDA style throttle bodies that allow for superior idle characteristics and astounding throttle response while improving emissions and economy through tight air/fuel ratio control.

    Speedmaster linkage set incorporates the throttle stops, idle controls, lever arms and joiner/balancer all in one. It also features a single screw adjustment for calibrating front to rear throttle shafts.

    The bell crank has a fully indexable eccentric cable pulley that enables good slow speed drivability and still attain full throttle geometry.

    Speedmaster throttle bodies have the following feature:

    - CNC machined, Heat treated 601 Cast aluminum.
    - Butterflies

    • Engine Block Style: Stock/OEM standard deck
    • Injection Style: 8 Throttle body
    • Basic Operating RPM Range: Idle-7,000
    • Intake Trumpets: Intake Trumpets Included
    • EGR: No
    • Injectors Included: No
    • Fuel Rails Included: Yes
    • Throttle Body Included: 8 Pieces
    • Base Material: Aluminum
    • Casting Base Finish: Polished

    Notes:

    • Requires EFI System / Injectors and Sensors
    • Works with distributor 121-2375MSD

    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

  • Part TypeIntake Manifold
    BrandSPEEDMASTER
    Package Height11.7
    Package Width12.7
    Package Length22.2
    Weight31.59 PG
    Part CategoryPerformance Parts
    Throttle Body Bore Size (Mm)50
    Part FitmentSemi Universal
    Engine Make/SizeChevy Small Block
    Vendor Part Number1-148-003
    Package Qty1
    Package TypeEA
    No Questions
    No Reviews

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    Some parts are not legal for use in California or other states with similar laws / regulations
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