Holley Intake Manifold 300-521
Holley Intake Manifold 300-521 Holley Intake Manifold 300-521 Holley Intake Manifold 300-521

Holley Intake Manifold 300-521

$3,436.99 ea
Condition: NEW
Availability:Backordered until 08/12/2021
Out of stock at HOLLEY PERFORMANCE PRODUCTS as of 08/01/2021
Supplier has not provided any fitment data for this product.
Shipping Note:Standard Delivery

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Muscle Cars & Classics always recommends professional installation of our products. Buyer assumes risk of damage caused by improper installation.

Holley Intake Manifolds feature a cast aluminum construction and have a long tradition of being one of the best products on the market. Review the information below for Holley intake specifications.
  • [3] Holley 2-BBL Carbs
  • High Quality Steel Fuel Lines
  • Progressive Throttle Linkage
  • Reusable Air Filters With Polished Housings
  • Dichromate Carburetor Finish
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
Installation Notes:
Requires small cap distributor (up to 5-1/8" Diameter), or MSD 8361. HEI style distributor is too large and will not fit. ***There is currently no kick down linkage adaptation for automatic transmission application. Replacement filter: Height- 2.5"; Length- 6.5"; Width- 4.3". Use Weiand 90633 or comparable filter.

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


Barrel Two
Barrels 2
Carburetor Type 2300
Carburetor Use Performance and Race
CFM 350
Cylinder Head Type Standard
Emission Without EGR
Emission Code 3
Engine Make/Size Chevy Small Block (262-400)
Finish Dichromate
Fuel Gasoline
Fuel Type Gasoline
Manifold Type Weiand 3x2 Dual Plane
Material Aluminum
Model 2300
Number of Carbs Three
Part Type Engine Intake Manifold
Position Upper
RPM Range Idle -5500
Supercharged Application No
Usage Street/Hi-Performance
WARNING CA Proposition 65 WARNING: Cancer and Reproductive Harm

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