SKU: 71932378672

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

Sale price$449.98 Regular price$499.98
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Description

Holley Modular Lo-Ram EFI Manifold LS1/2/6 - 300-621Overview: 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 Silver
Construction Cast
Emission Code 3
Engine GM Small Block Gen III/IV (LS Based)
Finish Satin
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: 71932378672

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4.1 ★★★★★
Based on 25 reviews
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J
Verified Purchase
Jon F
Lexington, US
★★★★★ 2
Great shoe, horrible lace design.
Size: 13, Color: White, Size: 13, Color: White
This shoes look great and the materials for the actual shoe feel great. They run a little big that doesn't bother me. Unfortunately, the lace design is horrible. I've now have 2 pairs of these shoes and both times the bottom lace has ripped out of the stitching. The first time was on the 2nd day I wore them, and the replacement pair to those it happened after I walked 20 feet. Both times I've tied a knot in the bottom lace so that I could get through the day. Ideally these laces should be connected together and not attached to the shoe (this is how both of my Skechers Slip-ins are designed). Because I like the rest of the shoe so much I'm buying elastic laces to replace the horrible original laces.
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Reviewed in the United States on March 14, 2025
L
Verified Purchase
Larry
Battle Creek, US
★★★★★ 5
Good value for the money.
Size: 9.5 Wide, Color: Beige
Comfortable right out of the box. Great style and well made. The more you wear the softer they get but maintain their overall appearance.
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Reviewed in the United States on May 25, 2026
A
Verified Purchase
Amazon Customer
Fort Morgan, US
★★★★★ 5
Very good quality for a reasonable price.
Size: 10, Color: Grey
Very good quality, very soft, very comfortable, look amazing, I’m very happy.
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Reviewed in the United States on May 23, 2026
M
Verified Purchase
Mike L.
Houston, US
★★★★★ 4
Comfortable fit for slip-in fabric shoes
Size: 14, Color: Black/Black
My first experience with Marc Joseph. I typically purchase dress and casual work shoes from Florsheim and occasionally Rockport. I'm giving these four stars because the initial fit and feel appear solid. Depending on the shoe brand I wear a size 14 or 15. My feet are slightly wide but I don't alway need wide fit. These size 14 fit well with wide enough toe box. I've tried slip in shoes before and they just don't feel right. These somehow work and there is no heel slip. My only reservation is the high lip on the heel for slip-in and hope they dont catch pant hems. I gave 4 stars because I'll have to determine durability. Granted they are a light fabric shoe with a soft rubber tread. I'd like them to last for at least 6 months..and use them for business casual work wear during warm weather.
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Reviewed in the United States on May 19, 2026
C
Verified Purchase
Chris
Alexandria, US
★★★★★ 5
Stylish and comfortable.
Size: 8 Wide, Color: Black/Black
Shoes look great and fits well. Definitely recommend pocking another pair.
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Reviewed in the United States on May 10, 2026

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