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Holley LS Modular Lo-Ram EFI Intake Manifolds 300-621BK Manifolds, Modular, Ultra EFI, Cathedral Port Head, Multi-port, Standard Deck, 105mm Bore, Aluminum, Black, Chevy, 4.8-6.0L, Each

Holley LS Modular Lo-Ram EFI Intake Manifolds 300-621BK Manifolds, Modular, Ultra EFI, Cathedral Port Head, Multi-port, Standard Deck, 105mm Bore, Aluminum, Black, Chevy, 4.8-6.0L, Each

A$2,458.90
LOW STOCK! Est Ship 4-7 days. In stock at 2 locations (more than 10 available)

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Description

Intake Manifold - Ultra Lo-Ram - 105 mm Throttle Body Flange - Fuel Rails Included - Cathedral Port - Multi Port - Aluminum - Black Paint - GM LS-Series - Kit


Data: v2 - Desc: v4.2 - Upd: 2026-11-08 02:15:44

Data: v4.2 - Upd: 2026-11-08 06:34:12

Features

Note for Australian and European Markets

Unless otherwise stated, this product may be engineered for use in Left-Hand Drive vehicles. Steering components, pedals, shifters, linkages, wing mirrors, instrument clusters, panhard rods/traction bars, drag links, brake boosters, brake or clutch lines, accelerator cables, heater cores, some master cylinders and adjacent parts can vary between LHD and RHD configurations. In some models compenents such as windscreen wiper arms, motors and linkages could differ in their size and orientation. Items such as floor mats & dash mats may have differences in their structure around the front row (or padding in different locations). In many cases items are identical depending on the design of the vehicle and part, but may have differing mounts, lengths or bolt patterns. Carefully review the product images and details to ensure suitability for your vehicle, or contact StreetFX support if you are unsure. Returns are not accepted for special order products.

(keyword: manifolds)

Vehicle Compatibility and Return Conditions.

This item was designed and engineered in the USA for US domestic vehicles. OBD tools, ECUs, dongles, programmers, and tuners may have limited compatibility with vehicles outside the USA due to regional differences in emission standards and system configurations. Some features and functionality may vary depending on the vehicle and location.

Some electronic tuning devices and programmers require activation, registration, or pairing with a specific vehicle’s VIN (Vehicle Identification Number). Once activated or paired, these devices may become permanently associated with that vehicle, restricting or preventing their use on another vehicle, resticting our ability to offer returns or exchanges.

Please review the product details and images to ensure it meets your needs. For clarification or assistance, feel free to contact a StreetFX agent. Note: Returns are not accepted for special order or tuning products unless the unit is deemed faulty.

(keyword: efi)

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Specifications

Reference Information

Reference Data (Provide these details to our support team)
Brand Name/s Holley, Hilborn, Holley Efi, Retrobright, Terminator X
StreetFX SKU hly300-621BK
SFX Item ID 4782933
Accounting SKU hly-300-621BK
Manufacturer SKU 300-621BK
Manufacturer UPC 090127079676
Alternative References 300-621BK, HLY-300-621BK, HOL300-621BK

Intake Manifolds, LS Modular, Ultra Lo-Ram EFI, Cathedral Port Head, Multi-port, Standard Deck, 105mm Bore, Aluminum, Black, Chevy, 4.8-6.0L, Each

Holley LS Modular Lo-Ram EFI intake manifolds are designed for GM LS Gen III and IV engines equipped with GM LS1/LS2/LS6 (cathedral port) 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 and a 105 mm throttle 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-feed configuration. The modular design allows the use of front-feed plenum entry, while intake design facilitates custom inlet duct and throttle body placement.

Additional features and specs:
• Cast aluminum construction with satin silver finish
• Modular design allows the use of front-feed plenum entry
• Clears 4th Gen Camaro and C5 Corvette cowls and hoods without modification
• With forced-induction and the short runner length the engine rpm at which peak power occurs is more likely to be coupled to the supercharger or turbocharger being used
• High-volume fuel rails and mounting hardware included with 3/4 in.-16 O-ring ports (8 AN)
• Fuel rail kits include 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

Product Attributes
BrandHolley
Manufacturer's Part Number300-621BK
Part TypeIntake Manifolds, Fuel Injected
Product LineHolley LS Modular Lo-Ram EFI Intake Manifolds
UPC090127079676
Cylinder Head ConfigurationCathedral Port LS1/LS2/LS6
Fuel Injection StyleMulti-port
Intake Section IncludedComplete
Throttle Body Bore Size105mm
Engine Block Deck HeightStandard deck
Injectors IncludedNo
Multi-Port Fuel Rails IncludedYes
EGRNo
Aftermarket Fuel Rail RequiredYes
Throttle Body IncludedNo
Supplemental Bosses Cast-InNo
Supplemental Bosses MachinedNo
Runners IncludedYes
Runners RemovableNo
Plenum MaterialAluminum
Plenum FinishBlack
Base MaterialAluminum
Base ColorNatural
RemanufacturedNo
QuantitySold individually.
NotesFuel rails are machined for -8 AN O-ring female fittings. Intake manifold features a plenum height of 5.17 in. and is designed for forced induction applications with peak power of 7,000 to 8,000 rpm.

Compatibility

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