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Holley EFI Holley LS EFI Manifold, 2x4 Dual Plane GM LS1/LS2/LS6 300-121

Holley EFI Holley LS EFI Manifold, 2x4 Dual Plane GM LS1/LS2/LS6 300-121
Holley EFI Holley LS EFI Manifold, 2x4 Dual Plane GM LS1/LS2/LS6 300-121
$776.99 ea
NEWOut of stock with our supplier as of 06/12/2024
Model: 3992507
STANDARD
DELIVERY
Holley EFI 2x4 Dual Plane Intake Manifold, LS Gen 3 LS1/LS2/LS6 engines
Features:
  • The dual-plane equal-distribution layout produces great mid-range torque without compromising top end power
  • Carbureted and EFI versions available
  • Power band from 1500-7000 rpm
  • Appropriate for any street/performance, muscle car, or street rod enthusiast
  • Cast aluminum construction
  • Intended for use on all GM LS Gen III engines equipped with LS1/LS2 style cathedral port cylinder heads
  • Carb Flange Center-To-Center: 8-5/8”
  • The LS engine architecture does not utilize an intake mounted water neck or distributor so it’s perfect for two Holley carburetors and this intake.
All GM LS Gen 3 engines equipped with LS1/LS2 style cathedral port cylinder heads. NOTE: The EFI versions of the LS HI-Ram intake manifold and fuel rail are designed to accept Bosch Style EV-1 or Magneti Marelli Pico fuel injectors. OE LS fuel injectors may not fit properly in the Hi-Ram EFI intake manifold fuel rail assembly. There is a kit available separately for the LS7 Hi-Ram EFI to allow the use of stock LS7 fuel injectors, P/N 300-230 (see below in the service parts section).
Installation Notes:
All GM LS Gen 3 engines equipped with LS1/LS2 style cathedral port cylinder heads. NOTE: The EFI versions of the LS HI-Ram intake manifold and fuel rail are designed to accept Bosch Style EV-1 or Magneti Marelli Pico fuel injectors. OE LS fuel injectors may not fit properly in the Hi-Ram EFI intake manifold fuel rail assembly. There is a kit available separately for the LS7 Hi-Ram EFI to allow the use of stock LS7 fuel injectors, P/N 300-230 (see below in the service parts section).

About Holley Performance Products

Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every Monster Energy NASCAR Cup team and nearly every NHRA Pro-Stock champion for four decades. Now, Holley EFI products power these cars and are dominating the performance world. Holley products for GM's popular LS engine are dominating the LS scene as well. Holley's products also include performance fuel pumps, intake manifolds and engine dress-up products for street performance, race and marine applications. As a single solution or partnered with products from other Holley companies we can give you the edge you need over the competition!

Downloads:

Download Name File Size
199r10577rev3.pdf298.32KB

Videos:

Specifications:

Color Silver
Construction Cast
Emission Code 4, 3
Engine GM LS1/LS2/LS6
Finish Silver
Flange Style 4150 Square Bore
Front Height 4.47 inch
Fuel System Type EFI
Manifold Type Dual Plane
Part Type Engine Intake Manifold
Product Type Intake Manifold
Rear Height 5.54 inch
RPM Power Band 1500-6500 RPM
Warranty Limited 90 Day

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Holley EFI Holley LS EFI Manifold, 2x4 Dual Plane GM LS1/LS2/LS6 300-121:
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