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Holley Race Intake Manifold 300-256BK

Holley Race Intake Manifold 300-256BK
Holley Race Intake Manifold 300-256BKHolley Race Intake Manifold 300-256BKHolley Race Intake Manifold 300-256BKHolley Race Intake Manifold 300-256BKHolley Race Intake Manifold 300-256BKHolley Race Intake Manifold 300-256BKHolley Race Intake Manifold 300-256BKHolley Race Intake Manifold 300-256BKHolley Race Intake Manifold 300-256BK
$909.99 ea
NEWARRIVING SOONEstimated Ship Date 04/10/2023 (If Ordered Today)64 available from HOLLEY PERFORMANCE PRODUCTS as of 03/26/2023
Model: 3992583
Supplier has not provided any fitment data for this product.
[More Info]
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.
  • Maximum Performance Race Design w/Hood Clearance Consideration
  • Lighter Than Other Split Race Intakes
  • Split Feature Making Porting Efforts Easy
  • 1/3 to 1/2 The Price Of Other Split Race Intakes
  • Captured O-Ring Seals At Head Ports and Split
  • Vacuum Port Options Incl. (2) 1/8; (1) 1/4; (1) 3/8 NPT Ports
  • A-B Height - 7.32 in. (0 Deg carb flange angle)
  • Port Size 3.28 in. Height x 1.10 in. Wide
  • Carb Flange - Std 4150 For Up To 1-3/4 in. Dia. Throttle Bores
  • As-Cast Runner Area - 3.5 in. Square at Runner Entry
  • As-Cast Runner Area - Tapered To 2.9 in. Square at Flange Exit
Holley Performance Emission Code 3: This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles. The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles: 1965 and older U.S. manufactured California Certified vehicles/1967 and older U.S. manufactured Federally Certified vehicles/1967 and older Foreign manufactured vehicle. The following vehicles are considered Racing Use Only Vehicles: Racing Use Only Vehicles are vehicles that are used exclusively for competition and that are not registered and that may never be used on the street. WARNING: It is against the law to install this part on an Emissions Controlled Vehicle. The following vehicles are considered Emissions Controlled Vehicles: 1966 and newer U.S. manufactured California Certified vehicles/1968 and newer U.S. manufactured Federally Certified vehicles/1968 and newer Foreign manufactured vehicle
About Holley Performance Products

Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every Monster Energy NASCAR Cup team and nearly every NHRA Pro-Stock champion for four decades. Now, Holley EFI products power these cars and are dominating the performance world. Holley products for GM's popular LS engine are dominating the LS scene as well. Holley's products also include performance fuel pumps, intake manifolds and engine dress-up products for street performance, race and marine applications. As a single solution or partnered with products from other Holley companies we can give you the edge you need over the competition!


Download Name File Size



Barrels 4
Color Black
Construction Cast
Cylinder Head Type Standard
Emission N/A
Emission Code 3
Engine GM Small Block Gen III/IV (LS Based)
Engine Make/Size GM LS1/LS2/LS6
Finish Black
Flange Style 4150 Square Bore
Front Height 7.32"
Fuel System Type Carb
Manifold Type Split Single Plane
Number of Carbs One
Part Type Engine Intake Manifold
Position N/A
Rear Height 7.32"
RPM Power Band 2500-7000
RPM Range 2500-7000
Usage Racing


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Holley Race Intake Manifold 300-256BK:
Classic Nova 2023