SKU: 59839583273

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

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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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Bill H
Pawtucket, US
★★★★★ 4
These Ones Last - Great for Small-Medium Dogs
I really want to give 5 stars but after a week, 3 of 5 squeak no more. Regardless, more of a donut shape and great for small-medium jaws. Safe to throw around the house and the soft latex easily handles bite after bite without falling apart like other tennis-ball like dog toys. These ones last and are good for hours of fun.
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Reviewed in the United States on May 3, 2025
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Gisela
Lexington, US
★★★★★ 5
Pelotitas de juguete
Muy bonita y mi perrita le encanto
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Reviewed in the United States on May 18, 2026
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carol
Lexington, US
★★★★★ 5
They KNOW that latex smell and they are hard when you first get them!
My dogs love these! I just noticed I bought them 18 TIMES! 😧 I know it's the laytex smell and they try so hard to get that squeaker out! I'd yell "new toys" and throw 3 in different directions! I know they are expensive but my dogs and I have SO much fun 😊🐾🐾
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Reviewed in the United States on March 24, 2026
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Andreia
Waukegan, US
★★★★★ 5
My dog love it!
My dog's favorite toy, durable even with my dog trying to destroy it. not too noisy.
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Reviewed in the United States on October 6, 2025
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Dawn
Carnegie, US
★★★★★ 5
My dog LOVES these balls
Awesome balls! Soft, squishy, and dog can get their teeth into them but they don’t get damaged. My dog absolutely loves them!
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Reviewed in the United States on January 6, 2026

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