Holley Single Plane EFI Split-Design Race Intake Manifold GM LS1/LS2/LS6 300-255
SKU: 49517497758

Holley Single Plane EFI Split-Design Race Intake Manifold GM LS1/LS2/LS6 300-255

Sale price$224.97 Regular price$249.97
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Description

Holley Single Plane EFI Split-Design Race Intake Manifold GM LS1/LS2/LS6 300-255Overview: 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 ? Throttle Body 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
  • Billet Fuel Rails and rail mounting hardware included.

Application:

Year Make Model Submodel Engine Size
Universal

Specs:

Barrels 4
Brand Holley
Color Silver
Construction Cast
Emission Code 3
Engine GM LS1/LS2/LS6
Finish Satin
Flange Style 4150 Square Bore
Front Height 7.32"
Fuel System Type EFI
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:
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  • 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: 49517497758

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Deviant
Fort Morgan, US
★★★★★ 5
Amazon not delivering after 2 days past delivery date
Size: 36, Color: Camo
These shorts are awesome some of my favorite but Amazon has delayed the out for delivery 2 days in a row now from the original 2 days was supposed to be delivered
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Reviewed in the United States on April 25, 2026
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KuroodoD
New York, US
★★★★★ 3
I love them but pockets tear easily
Size: 34, Color: #01black
I love them. They look nice and they are comfortable. I bought a total of three and they're all I wear in the summer. Unfortunately the strap pockets wear out easily. On my left pocket I store a ridge wallet and my keys. For two of my most worn pair, the strap tore up to where it no longer holds the pocket closed properly. On one of those in the same pocket, a hole ended up torn in the corner. The third one I had to throw out after it shrunk after being washed improperly (can't wash them like I did my previous shorts which I washed the same way as the rest of my clothes). I think I'll continue to wear them, maybe even buy one more, until I find something better.
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Reviewed in the United States on December 31, 2023
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Sean reddin
Lexington, US
★★★★★ 5
Pocket and ability to hook my speaker to
Size: 32, Color: Black, Size: 32, Color: Black
I can't believe how comfortable they are and I'm very happy with all the pockets in the shorts. I bought the black as it my favorite color but will definitely be ordering all the colors available as they can be used as dress shorts.
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Reviewed in the United States on June 25, 2025
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Our1000Words
Charlottesville, US
★★★★★ 5
Nice and Yellow Casual Dressed up Perfection
Size: Medium, Color: Beige, Size: Medium, Color: Beige
The shirt looked felt and fit great on my son. It was lightweight, the cor was as appeared on the screen. The perfect shade of yellow. The quality was very good and it is true to size. I got him a medium he is 170 5/10
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Reviewed in the United States on June 2, 2026
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Robert Pratt
Grantham, US
★★★★★ 5
Fit is good.
Size: X-Large, Color: Navy Blue
Fit is good, American XL. Not tailored for untucked wearing as are real guayaberas.
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Reviewed in the United States on May 29, 2026

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