Holley LS1/LS2/LS6 Ultra Lo-Ram EFI Intake Manifold, Black Finish (HO300-621BK)
SKU: 59839583273

Holley LS1/LS2/LS6 Ultra Lo-Ram EFI Intake Manifold, Black Finish (HO300-621BK)

Sale price$1087.65 Regular price$1208.50
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Description

Holley LS1/LS2/LS6 Ultra Lo-Ram EFI Intake Manifold, Black Finish (HO300-621BK)HO300 621BK BLACK HOLLEY MODULAR LO RAM Suit Single GM 105mm Throttle Body Part Number: HO300 621BK The Holley LS1 2 6 Ultra Lo Ram intake manifold kits are designed for GM LS Gen III and IV engines equipped with GM LS1 2 6 (cathedral port) cylinder heads. These intake manifolds will work with OE or aftermarket cylinder heads. The Ultra Lo Ram intake manifolds are designed for forced induction (supercharged or turbocharged) engine applications and the

HO300-621BK - BLACK HOLLEY MODULAR LO-RAM

Suit Single GM 105mm Throttle Body

Part Number: HO300-621BK

The Holley LS1/2/6 Ultra Lo-Ram intake manifold kits are designed for GM LS Gen III and IV engines equipped with GM LS1/2/6 (cathedral port) cylinder heads. These intake manifolds will work with OE or aftermarket cylinder heads. The Ultra Lo-Ram intake manifolds are designed for forced induction (supercharged or turbocharged) engine applications and the 105 mm 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. 
The 300-621 Lo-Ram plenum entry was configured to provide a very low profile modular intake manifold suitable for turbocharged or centrifugally supercharged engines. 
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 LS1/2/6 (cathedral cylinder heads
Designed for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application.
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
Modular design allowing the use of front-feed plenum entry

Intake design facilitates custom inlet duct and throttle body placement

Low height to fit under a stock or mildly modified hood in the front configuration
Front entry plenum flange allows design & fabrication of special throttle body adapters or inlet ducts for custom installations
Clears 4th Gen Camaro and C5 Corvette cowls and hoods without modification
High volume fuel rails and mounting hardware included with ¾”-16 o-ring ports (8 AN)

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Exchange/Return Notes
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SKU: 59839583273

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Christina Garner
Omaha, US
★★★★★ 5
Incredibly soft!
Color: Cream, Size: Throw (50" X 60")
I absolutely love this Bedsure blanket! It is incredibly soft right out of the package and feels cozy without being too heavy. The fabric is plush and smooth, making it perfect for lounging on the couch, layering on the bed, or staying warm during chilly nights.
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Maddie
Alexandria, US
★★★★★ 5
Love this blanket!!!
Color: Cream, Size: Throw (50" X 60")
I absolutely LOVE this blanket!! It is an exact dupe for the “Lola” blanket. One of my friends has one and it feels the same and at just a fraction of the cost! It’s so soft and stretchy. It has such a nice weight to it and is the perfect size. I have already ordered 3 more for gifts this Christmas. I’m surprised this isn’t sold out!
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emmasize
Chelsea, US
★★★★★ 5
Incredible Dupe
Color: Pink, Size: Throw (50" X 60")
I never leave reviews, but I was looking for a dupe blanket for my kiddos after getting a much more expensive brand blanket for myself, and this one is excellent. It’s double-sided so the same mega-soft on each side and cozy but not too heavy. I’m now getting them as Christmas gifts for everybody. A+ purchase
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Reviewed in the United States on December 15, 2025
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Amazon Customer
Carnegie, US
★★★★★ 5
Oh my!!!
Color: Pink, Size: Throw (50" X 60")
This is the softest blanket ever! I sleep with it next to my skin and my bigger blanket on top because I so love how soft it is. If they ever make this in a larger size I will definitely get it!!!! LOVE THIS!!!!
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Lisa L
Omaha, US
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Warm, cozy and thick high-quality throw.
Color: Cream, Size: Throw (50" X 60")
This is thick, non-shedding blanket - and for cold, winter nights… THE BEST. My granddaughters found it to be too warm, but not this grandma! I’m fit, but dang, these super-cold Alaska nights allow me to stay warm and cozy! If you have someone who runs a bit on the colder side, they will love this blanket! It washes beautifully. Great value!
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Reviewed in the United States on December 24, 2025

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