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Product Summary

EFI Fuel System Type, Multi-port Injection Style, Black

  • Designed for GM LS Gen III and IV engines equipped with GM LS3/L92 cylinder heads•
  • Engineered for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application.
  • Low height to fit under a stock or mildly modified hood in the front configuration
  • Front entry plenum flange allows design and fabrication of special throttle body adapters or inlet ducts for custom installations
  • Clears C6 Corvette cowls and hoods without modification

Rebates Available

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Key Specs

MFG. Part #300-680BK
BrandHolley
Intake Manifold TypeLo-Ram
RPM Range3,500-8,000
Material TypeCast Aluminum
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Need To Know

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Holley 300-680BK Details

Available with single or dual injector provisions and a burst panel flange, the LS3 Ultra Lo-Ram intake manifold is designed for boosted combinations with hood clearance in mind. The Holley LS3 Ultra Lo-Ram intake manifold kits are designed for GM LS Gen III and IV engines equipped with GM LS3/L92 cylinder heads. These intake manifolds will work with OE or aftermarket cylinder heads. The Lo-Ram intake manifolds are designed for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application. The front plenum flange has a 105 mm opening to work with throttle body part number 112-581 or similar models. The base intake manifold is designed with a lower overall height to fit under a stock or mildly modified hood in the front configuration. The LS3 Lo-Ram is constructed to provide a very low profile modular intake manifold suitable for fabrication of special throttle body adapters or inlet ducts for custom installations. Available with single or dual injector provisions and a burst panel flange options. The fuel rail kits come with two sets of brackets. A set for long (usually standard length) fuel injectors and a set for short (such as Pico, or LS7) fuel injectors.

Features:

  • Designed for GM LS Gen III and IV engines equipped with GM LS3/L92 cylinder heads•
  • Engineered for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application.
  • Low height to fit under a stock or mildly modified hood in the front configuration
  • Front entry plenum flange allows design and fabrication of special throttle body adapters or inlet ducts for custom installations
  • Clears C6 Corvette cowls and hoods without modification
  • Available with single or dual injector provisions and a burst panel flange.
  • High volume fuel rails for eight and sixteen injector configurations. Mounting hardware included with 3/4-16 O-ring ports (8 AN)
  • Billet options for the top and throttle body adapters are available seperately.

Charts

Rebates

Holley Fuel Up Spring Savings Event 2026

Save 10% instantly on select products across the Holley family of performance brands during the annual Holley Fuel Up Spring Savings Event 2026. Instant rebate period has been extended and now runs from March 30, 2026 through April 19, 2026.

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

Holley 300-680BK Specifications

KEY SPECS
MFG. Part #300-680BK
BrandHolley
Intake Manifold TypeLo-Ram
RPM Range3,500-8,000
Material TypeCast Aluminum
GENERAL
Fuel System TypeEFI
Injection StyleMulti-port
FinishPowder Coated
ColorBlack
EGRNo
Cylinder Head ConfigurationRectangular Port
Throttle Body Bore Size105mm
Intake Section IncludedComplete
Plenum MaterialAluminum
Plenum FinishPowdercoated
Base FinishBlack Powder Coated
Base MaterialAluminum
Throttle Body IncludedNo
Injectors IncludedNo
Aftermarket Fuel Rail RequiredYes
Fuel Rails IncludedYes
Hardware IncludedYes
Overall Height6.86"
Runners IncludedYes
Runners RemovableNo
Supplemental Bosses Cast-InNo
Supplemental Bosses MachinedNo
Emission Code3
Sold in QuantityEach
GTIN Code090127100929

Fitment

  • 6.2 Chevy LS V8

  • 6.2 Chevy LS V8

  • 6.2 Chevy LS V8

  • GM L76

  • 6.2 Chevy LS V8

  • 6.2 Chevy LS V8

Customer Impersonation Script