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)

Shipping Notes
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Exchange/Return Notes
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SKU: 59839583273

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Michelle Rode
West Palm Beach, US
★★★★★ 5
Jackets
Size: Small, Color: Safety Green
What a great value! I bought three jackets for my husband for work. He loves them...they're comfortable and lightweight! Covers his upper body and durable.
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Reviewed in the United States on May 14, 2026
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AMZN Reviewer
Boise, US
★★★★★ 5
Comfy and warm for everyday wear
Size: Medium, Color: Navy Full Zip
I bought this Fruit of the Loom Eversoft Fleece Hoodie for my husband and he realy likes how soft it feels on the inside. The fabric is thick enough to keep him warm during his morning walks but it is still breathable so he doesnt get too sweaty while he is moving around. It has that moisture-wicking feature which is great because it stays dry even when it is a bit humid outside. The fit is just right and the hood stays up good without being too tight around his neck. It is hard to find hoodies that dont pill up after the first wash but this one has held up great so far and still looks brand new. For the price it is a total steal and much better quality than some of the more expensive brands we have tried before. I will definitely be ordering a few more colors for him soon.
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Reviewed in the United States on January 4, 2026
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Kellarease
West Palm Beach, US
★★★★★ 5
PERFECT!
Size: XX-Large, Color: Khaki Heather Full Zip
Most perfectly soft, warm, wonderful zip up hoodie, EVER! Own three and ordered a couple for family members who had borrowed mine! A must have!
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Reviewed in the United States on May 25, 2026
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G.L.
Charlottesville, US
★★★★★ 3
Thinner fabric than usual.
Size: Large, Color: Black Heather Full Zip
Good quality, but much thinner fabric than my other hoodie sweatshirts. Because of this, I have not been wearing it, but instead I've been wearing the thicker ones I already owned. This item was a good price; now I see why. It's too light for winter, and too heavy for summer. Not sure when it will be useful.
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Reviewed in the United States on May 17, 2026
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JREMUSIC
Boise, US
★★★★★ 5
Good value
Size: 10.5, Color: Black/Black
They fit and they stay on my feet (I was worried because these are slip-ons).
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Reviewed in the United States on May 31, 2026

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