Features:

• Designed for GM LS Gen III and IV engines equipped with GM LS1/2/6 (cathedral port) cylinder heads
• Designed for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application.
• Modular design allowing the use of the included plenum entry
• Low height to aid the packaging of a plenum mounted air-to-water intercooler in a top-feed configuration or to fit under a stock or mildly modified hood in the front-feed configuration
• High volume fuel rails and mounting hardware included with ¾”-16 o-ring ports (8 AN)

About Holley EFI

Find standalone EFI for LS, Coyote, Hemi and more at Holley.com. From engine swapping to managing up to 4000 horsepower, we have a solution for every project!

• 90mm, 95mm, and 105mm Throttle Body Cable Bracket

  Holley Hi-Ram or Mid-Rise intakes only

  Part# 20-149

  $27.15

  Qty: 

  Add To Cart
• Gasket Kit, Hi-Ram Plenum O-Ring Cord

  Gasket Kit, Hi-Ram Plenum O-Ring Cord

  Part# 508-21

  $34.85

  Qty: 

  Add To Cart
• Holley EFI Lo-Ram Manifold 105mm Throttle Cable Bracket

  For Holley 300-621 and 300-621BK

  Part# 20-154

  $27.17

  Qty: 

  Add To Cart
• Holley Lo-Ram Intake Manifold Mounting Stud Kit

  Intake Manifold Mounting Stud Kit Lo-Ram LS Engines

  Part# 300-612

  $22.46

  Qty: 

  Add To Cart
• Holley Fastener and O-Ring Cord Kit, LS1/2/6 Lo-Ram Manifold

  Holley Fastener and O-Ring Cord Kit, LS1/2/6 Lo-Ram Manifold

  Part# 300-613

  $25.09

  Qty: 

  Add To Cart

This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles.

The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

• 1965 and older U.S. manufactured California Certified vehicles
• 1967 and older U.S. manufactured Federally Certified vehicles
• 1967 and older Foreign manufactured vehicle

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

The following vehicles are considered Emissions Controlled Vehicles:

• 1966 and newer U.S. manufactured California Certified vehicles
• 1968 and newer U.S. manufactured Federally Certified vehicles
• 1968 and newer Foreign manufactured vehicle