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Ships within 48 hours · Estimated delivery Jul 23 - Jul 28
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Description
4150 950Cfm Xp Alum Dp Sc W Black Billet-0-80577SABy popular demand, Holley is expanding the draw thru supercharger carburetor line to now include the XP series. Like the existing HP line, these are available in 600, 750, and 950 CFM flow rates and standard polished with black accents. The feature laden XP includes a contoured venturi inlet for balanced air flow, screw in air bleeds for precision tuning capabilities, high flow billet metering blocks, billet base plate, and Dominator style fuel bowls
By popular demand, Holley is expanding the draw-thru supercharger carburetor line to now include the XP series. Like the existing HP line, these are available in 600, 750, and 950 CFM flow rates and standard polished with black accents. The feature-laden XP includes a contoured venturi inlet for balanced air flow, screw in air bleeds for precision tuning capabilities, high flow billet metering blocks, billet base plate, and Dominator style fuel bowls which allow plumbing from either side. Supercharger XP carburetors also have a unique capability that allows their power valves to reference the intake manifold vacuum below the supercharger. This allows the power valve to operate as it should, based off intake manifold vacuum. A power valve provides further enrichment to the main metering system under load (low vacuum) conditions. Holley XP carburetors are the standard for square bore race carburetors. Race-Ready out of the box!
Features:
- Tumble polished shiny finish for good looks
- Big block Chevrolet 2x4, 871 & 1071 blower calibration
- Contoured venturri inlet offers balanced airflow for increased horsepower
- Screw in air bleeds for precision tuning capabilities
- Dual 30cc accelerator pumps for additional fuel under initial acceleration
- Dual feed fuel inlets for constant high volume fuel delivery
- 4 corner idle allows you to precisely control your idle system
- Mechanical Secondaries for perfect off the line launches
- Boost referenced power valve for proper enrichment under acceleration
- Throttle lever cut off for clearance on a sideways application
- 100% wet-flow tested by Holley technicians to assure it arrives ready to run!
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.5 ★★★★★
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Product Reviews
★★★★★ 5
Pleasant taste, nice texture.
Flavor Name: Vanilla, Size: 30 Servings (Pack of 1)
Works well in my afternoon smoothie. Pleasant vanilla taste.
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Reviewed in the United States on March 16, 2026
★★★★★ 5
Sublingual works well for melatonin!
Size: 60 Count (Pack of 1), Style: Melatonin 5mg
Sublingual seems to be the way to go with melatonin. It works well for me. It’s great this company offers a variety of doses. I was doing 10mg but I learned it might not good to stay on that high a dose for an extended period of time. So I switched to 5mg and it still works well.
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Reviewed in the United States on January 21, 2025
★★★★★ 5
Use for sleeping
Size: 60 Count (Pack of 1), Style: Melatonin 5mg
Great little pill for sleeping. No after taste, place under tongue and quickly dissolves.
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Reviewed in the United States on June 27, 2024
★★★★★ 5
A peaceful nights sleep always!!!
Size: 60 Count (Pack of 1), Style: Melatonin 5mg
Sleep peacefully, undisturbed, wake up refreshed. None habit forming.
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Reviewed in the United States on April 24, 2026
★★★★★ 4
Works
Size: 60 Count (Pack of 1), Style: Melatonin 5mg
Been taking these for years.. They work although sometimes I think they flare up my heartburn
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Reviewed in the United States on October 25, 2025