SKU: 33509781705

Holley Single Plane Split-Design Intake Manifold GM LS1/LS2/LS6 Black 300-256BK

Sale price$350.98 Regular price$389.98
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Description

Holley Single Plane Split-Design Intake Manifold GM LS1/LS2/LS6 Black 300-256BKOverview: The new Holley Single Plane Race intake manifold were designed with performance in mind. They feature a race bred, two piece split feature that was previously only found on the most expensive race intakes. The manifold will fit GM LS Gen III engines with cathedral port heads and are intended for 4150 style square bore flanged carburetors or throttle body EFI. The LS Race single plane intake manifold was designed for hi performance racing

Overview:

The new Holley Single-Plane Race intake manifold were designed with performance in mind. They feature a race bred, two piece split feature that was previously only found on the most expensive race intakes. The manifold will fit GM LS Gen III engines with cathedral port heads and are intended for 4150 style square bore flanged carburetors or throttle body EFI. The LS Race single-plane intake manifold was designed for hi-performance/racing engine applications, 5.3 to 6.2+ liter displacement, and maximum engine speeds of 6000-7000 rpm, depending on the engine combination. This single-plane design provides optimal performance across the RPM spectrum while providing maximum performance up to 7000 rpm. The Holley LS Race manifold incorporates a split feature, which allows disassembly of the intake for direct access to internal plenum and port surfaces, making custom porting and matching a snap. With shoulder bolt locators and O-ring seal, reassembly is simple and precise. Technical Data: ? A-B Height - 7.32" (0° carb flange angle) ? Port Size- 3.28" Height x 1.10" Wide ? Carburetor Flange - Standard 4150 for up to 1-3/4" diameter throttle bores ? As-Cast Runner Cross-Sectional Area - 3.5 in² at the runner entry tapered to 2.9 in² at the flange exit

Features:

  • Maximum performance race design with hood clearance consideration
  • Lighter than other split race intakes
  • Split feature making porting efforts easy!
  • 33 to 50% the price of other split race intakes
  • Captured O-ring seals at head ports and split
  • Vacuum Port options include (2) 1/8, (1) 1/4, and (1) 3/8, NPT ports at the carb flange
  • Black Finish

Application:

Year Make Model Submodel Engine Size
Universal

Specs:

Barrels 4
Brand Holley
Color Black
Construction Cast
Emission Code 3
Engine GM LS1/LS2/LS6
Finish Black
Flange Style 4150 Square Bore
Front Height 7.32"
Fuel System Type Carb
Manifold Type Split Single Plane
Product Type Manifold
Rear Height 7.32"
RPM Power Band 2500-7000
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: 33509781705

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Joe R
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★★★★★ 4
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Style: 20W_USB-C, Size: 6FT
I really like this search strip as I installed the inside of my RV the only problem I have with it is if you were using bulky transformer style plugs like that of a iMac laptop, charger or other big transformers, you will not be able to use the USB outlets in the center and I don’t know if that’s by design to limit current flow, but it sucks.
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Reviewed in the United States on May 20, 2026
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Ron barker
Draper, US
★★★★★ 5
good value
Style: 20W_USB-C, Size: 6FT
works well
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Reviewed in the United States on April 16, 2026
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Cale Frederick
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★★★★★ 5
An absolute must for countertops used as workstations.
Style: 20W_USB-C, Size: 6FT
These were the best thing I did when we had to remodel and I added a large built in countertop. They are made well, and easy to install! They are very versatile since they are designed with both USB-A and USB-C ports along with the standard 110V plugs. I use these with my 3-D printers, laser engravers, computers, printers, and even a few coffee pots!
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Reviewed in the United States on April 21, 2026
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Randy Browning
Belleville, US
★★★★★ 5
No issues, and no instructions.
Style: 20W_USB-C, Size: 6FT
No, you don’t need instructions, because the hole dimensions are in one of the photos. 4” x 1.73” is perfect. Plug it in and all of the ports in both that we bought worked perfectly.
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Reviewed in the United States on March 9, 2026
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Peter Anfang
Carnegie, US
★★★★★ 5
Exactly what I expected!
Style: 20W_USB-C, Size: 6FT, Style: 20W_USB-C, Size: 6FT
Perfect for recessed lighting in our shiplap wall to go behind the TV. I will be buying these again for future projects I have planned!
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