1-148-042-01 Complete Downdraft EFI Stack Intake Manifold System GM LS1 [Black]
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SPEEDMASTERPART NUMBER: 746-1-148-042-01

1-148-042-01 Complete Downdraft EFI Stack Intake Manifold System GM LS1 [Black]

$2,45000
ShippingShips on 09/09/2026
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Chevy LS1
Complete Downdraft EFI Stack Intake Manifold System
  • GM LS1
  • Non-EGR
  • Idle-7,000 RPM
  • Aluminum Casting
  • Black Finish

    Speedmaster 1-148-042-01 Features:

    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 calib rating 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.

    • Higher state of tune and engine performance
    • Superior idle characteristics and astounding throttle response
    • Required Injector: Style: EV6 O-O, Distance: 1.480", Plug Style: USCAR, Manufacturer: FAST, MPN: 30507-8, Flow: 50 Lbs./Hr.

    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 Height11.75
    Package Width12.25
    Package Length22.0
    Weight26.0 PG
    Part CategoryPerformance Parts
    Basic Operating Rpm RangeIdle-7000
    ColorBlack
    Part FitmentSemi Universal
    Engine Make/SizeGM LS
    Vendor Part Number1-148-042-01
    Package Qty1
    Package TypeEA
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