What is a 4150 carburetor?

A 4150 carburetor is a common type of four-barrel carburetor, often identified by its specific flange pattern and dimensions. This Nitrous Express plate is designed to bolt directly between this style of carburetor and the intake manifold.

What else do I need to use this nitrous plate?

This is a conversion plate, so you will need a complete nitrous oxide system. This includes a nitrous bottle, nitrous and fuel lines, solenoids, and a way to activate the system, such as a switch or throttle-activated system.

Why is this product not CARB approved?

CARB (California Air Resources Board) approval is required for emissions-related parts sold in California. This nitrous plate conversion has not undergone the CARB certification process and therefore cannot be legally shipped to or used in California.

Specifications

Brand: Nitrous Express
Part #: NX675
UPC: 653374979887

Nitrous Express Assassin Plate Conversion 4150 ProPower

Name: Nitrous Express Assassin Plate Conversion 4150 ProPower
Brand: Nitrous Express
SKU: nitrous-express-nitrous-express-assassin-plate-conversion-4150-propower-t14-669464
Price: 544.26 USD
Availability: BackOrder

$544.26

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Nitrous Express Assassin Plate Conversion 4150 ProPower. Adds a nitrous system to your carburetor for a significant power boost.

Key Features

Fits 4150-style carburetors and intake manifolds.
Constructed from solid aluminum for a strong and lightweight design.
Direct-port spray pattern for improved fuel and nitrous distribution.
ProPower version is designed for higher flow rates.
Not CARB approved; cannot ship to California.
Includes Prop 65 warning.

This is a universal nitrous plate conversion designed for 4150-style carburetors. Verify compatibility with your specific carburetor and intake manifold setup.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

If you're looking to add a serious shot of horsepower to your carbureted engine, the Nitrous Express Assassin Plate Conversion is a well-built option. This system is designed to fit between your 4150-style carburetor and the intake manifold, providing a clean and effective way to introduce nitrous oxide into your engine. It’s a popular choice for racers and performance enthusiasts who want a noticeable increase in power without a complex installation.

The Assassin Plate itself is constructed from solid aluminum, making it lightweight yet strong enough to handle the demands of a nitrous system. It features a direct-port design, meaning it sprays nitrous and fuel directly into each cylinder port, which helps ensure a more even distribution and better atomization compared to older fogger-style systems. This improved distribution can lead to more consistent power delivery and a smoother engine response when the nitrous is activated. The ProPower designation indicates this plate is designed for higher flow rates, allowing for more aggressive nitrous tuning.

When installing this kit, remember that it's designed for 4150-style carburetors, so ensure your carburetor matches this footprint. You'll also need a complete nitrous system, including bottles, lines, and solenoids, as this is just the plate conversion. Keep in mind that this system is not CARB approved and cannot be shipped to California. It also carries a Prop 65 warning.