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    Holley Hi-Ram 105mm Cast Side Mount Plenum Top, GM Pattern | 300-302

    Vendor: Holley EFI
    Part Number: 300-302
    Save $55
    Sale Price $436.95 Regular Price $491.95

    Currently out of stock.

    Not sure it fits your vehicle?
    Email sales@berryperformancesales.com with your year, make, model and engine, and we'll help you check fitment before you order.
    Fast Fulfillment: In-stock orders typically ship within 1 to 2 business days.
    Free Shipping on Orders Over $99 | Excludes freight shipments
    International Shipping Available: email sales@berryperformancesales.com for a quote.
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    This cast aluminum side mount plenum top resembles the older Ford EFI manifolds, mounting the throttle body on the side of a Hi-Ram base for easier fabrication in boosted applications or a different look than a top-mounted throttle body.

    Specifications:

    • Construction: Cast Aluminum
    • Finish: Silver/Natural
    • Inlet Size: 105mm
    • Compatibility: GM style throttle body pattern
    • Fuel System Type: EFI
    • Type of Component: Manifold Top
    • Mounts to: Existing Holley Hi-Ram manifold bases
    • Part Number: 300-302

    Verified to fit under a Cervinis 2.5" cowl hood on 1979-1993 Mustangs with 351W & 302W Hi-Ram bases, when using motor mounts that retain stock engine location.

    FAQ

    What throttle body pattern does the 300-302 use?

    A GM-style pattern, 105mm inlet size.

    What does it mount to?

    Existing Holley Hi-Ram manifold bases, as a side-entry plenum top.

    Will it clear a Cervinis cowl hood?

    Yes, it's been verified to fit under a Cervinis 2.5" cowl hood on 1979-1993 Mustangs with 351W/302W Hi-Ram bases, using motor mounts that retain stock engine location.

    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
    • No P.O. Boxes. International orders need a shipping quote, so email us first.

    Read the full Shipping Policy

    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy

    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

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