Holley Modular Lo-Ram EFI Manifold LS1/2/6 - 300-621BK
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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Wolfpack Athletics
Pawtucket, US
★★★★★ 5
Surprisingly Tough Without Being Too Hard
Style: Black chew toys for dogs
The hardness on this bone is right in the sweet spot for aggressive chewers. It’s firm and durable enough that my dog hasn’t been able to tear chunks off or destroy it quickly, but it’s not rock-hard to the point where I’d worry about teeth damage. My dog usually goes through most toys pretty fast, and this one has held up really well. After extended chewing sessions, it only shows minor wear instead of deep cracks or breakage. It keeps his attention without splintering or becoming unsafe. If you’re looking for a bone that can handle strong jaws while still being safe for aggressive chewers, this one strikes a good balance and has been a solid option so far.
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Reviewed in the United States on January 2, 2026
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Verified Purchase
Sarah G
West Palm Beach, US
★★★★★ 4
Not completly indestructible but good buy
Style: Black chew toys for dogs, Style: Black chew toys for dogs
Dogs loved this. I have 5 pot mixed and they all have enjoyed this. I ordered two more after they enjoyed the first one so much. So far my dogs have not been as destructive as they have been in the past (especially on my couches). I have been home more recently so it could be a combination, but I think the bones have been helpful. Sturdier than the red Kong toys, but not as indestructible as the black kongs. As durable or more than the ruff dawg balls, and much more affordable than all of those. Also, some of my dogs are more selective on toys, but this one was an immediate hit, even with my dog that has shown now interest in ANY chew toy. We even walked through pet smart one day, and i tried to get him to play with every toy on the shelf- and he was not impressed. I even showed him the scented toys that cost $40-50 each. Happy that he took to this immediately. Keep an eye out. I heard one of my dogs hacking and coughing from the other room, but by the time I heard it and got to the room, it wasn’t clear what he was choking on. I had three of these bones in the room at the time, but there was also food and such around so hard to tell. Recommend supervising your dog with the toy in the beginning at least.
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Reviewed in the United States on April 28, 2024
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Verified Purchase
Kimberly Schiller
Charlottesville, US
★★★★★ 5
Lasts with a pitbull
Style: Black chew toys for dogs
Good for very aggressive chewers. Even large, strong jawed dogs. My 70lb pitbull loves them and they usually last 6 months before we have to replace (because she's chewed slowly down the ends) Would recomment!
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Reviewed in the United States on February 28, 2026
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Amazon Customer
Fort Morgan, US
★★★★★ 3
Great, but didn’t last
Style: Black chew toys for dogs, Style: Black chew toys for dogs
I have a 70 pound pitbull and he absolutely loves this toy. Unfortunately, within a couple of hours this toy started to crumble. Now, there are large crumbs breaking off that he started eating, so we have to toss it. He’s only had this for two weeks.
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Reviewed in the United States on January 8, 2026
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Julie Ann laclair
Battle Creek, US
★★★★★ 5
Great value for a great price
Style: Black chew toys for dogs
My dogs loves it!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 27, 2026

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