SKU: 63460473297

Holley Modular Lo-Ram EFI Manifold LS1/2/6 - 300-621BK

Sale price$494.98 Regular price$549.98
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Description

Holley Modular Lo-Ram EFI Manifold LS1/2/6 - 300-621BKOverview: The Holley LS1 2 6 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 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

Overview:

The Holley LS1/2/6 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 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 in the front-feed configuration. The 300-621 Lo-Ram front-feed 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 port) 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-feed 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)

Application:

Year Make Model Submodel Engine Size
Universal

Specs:

Brand Holley EFI
Color Black
Construction Cast
Emission Code 3
Engine GM Small Block Gen III/IV (LS Based)
Finish Black
Flange Style EFI
Front Height 6.86" height with throttle body adapter
Fuel System Type EFI
Manifold Type Lo-Ram
Product Type Manifold
Warranty Limited 90 Day
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 63460473297

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Anoni Miss
Los Angeles, US
★★★★★ 3
Not safe, easily chewed bits off
Mixed feelings. My puppies love them and love to chew on them but also chewed the edges off pretty quickly. I had to take away the first one after only a couple days of intermittent chew so it’s really not durable or long lasting. I don’t feel this is safe for a 12 week old puppy which is super small and can be a choking hazard.
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Reviewed in the United States on October 6, 2025
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Verified Purchase
Pooh
Lake Worth, US
★★★★★ 5
Very Small
These are tiny! Just perfect for my little dogs but one was lost within the first few minutes so I had to order another. I'm not so sure how safe it is for the fur children to chew on non-edible, non-digestible plastics but they seem to really like them.
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Reviewed in the United States on September 28, 2025
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Kristi S
Pawtucket, US
★★★★★ 5
A Hit with Both My Puppy and Older Dog!
I bought the Nylabone Moderate Chew FlexiChew Bone in the peanut butter and bacon flavor for my new puppy, and he absolutely loves them! What’s even better is that my other dog is just as obsessed with them, so it's been a hit with both. The size is perfect for my tiny puppy, and the flavor keeps them both engaged for a long time. These bones are durable enough to last, even with moderate chewing, and they help satisfy their natural chewing instincts. If you’re looking for a great chew toy for both puppies and small dogs, I highly recommend these Nylabones. They’re a definite favorite in our household!
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Reviewed in the United States on October 11, 2024
E
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Emily Cary
Boise, US
★★★★★ 5
Dog loves them.
Size: Medium, Style: Beef
They make excellent toys that hold up to a bulldog that chews. He loves these toys.
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Reviewed in the United States on March 31, 2026
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Verified Purchase
Andy & Christie
Carnegie, US
★★★★★ 5
My dogs love them
Size: Large, Style: Peanut Butter
One of the few toys my pit bulls can't break. They absolutely love these toys and play chase with them. Usually, they can break toys in less than 5 minutes, but not these.
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Reviewed in the United States on February 25, 2026

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