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Air and Fuel› Carburetors and Components

Weber

Carburetor Conversion Kit

$944.27 $579.50 Save $364.77

SKU: K644-38

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In Stock
Ships by Oct 12
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$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Weber K644-38 is a carburetor conversion kit designed for specific Nissan D21 models. This kit allows for the conversion from TBI (Throttle Body Injection) or EFI (Electronic Fuel Injection) to a Weber carburetor. It includes a genuine Weber 38/38 DGES carburetor, an adapter plate, linkage, levers, bracket, a chrome air filter, and a fuel pressure regulator.
Show original supplier description
The Weber K644-38 is a comprehensive carburetor conversion kit engineered to replace the stock TBI or EFI system on select Nissan D21 pickup trucks equipped with the Z24i engine. This kit facilitates the transition to a performance-oriented Weber 38/38 DGES downdraft carburetor, aiming to enhance engine response and driveability. The conversion kit includes a genuine Weber 38/38 DGES carburetor, a dedicated 99004.644 adapter plate, and all necessary linkage, levers, and brackets for installation. It also comes with a Redline chrome air filter and a Carter low-pressure fuel pump to ensure proper fuel delivery. Instructions are provided to guide the installation process. This kit is specifically designed for the 1986-1989 Nissan D21 Pickup models featuring the Z24i engine. Users have reported success with this conversion, noting improvements in throttle response and overall driving experience. The kit offers a way to upgrade the fuel and air delivery system for older Nissan trucks that may have been originally equipped with TBI or EFI.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandWeber
Part NumberK644-38
CategoryAir and Fuel
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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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