If you’re still fighting with the original Carter BBD carburetor on your AMC 258 inline-six, stop. You are fighting a losing battle against clogged idle tubes and erratic performance. The solution isn’t a rebuild kit—it’s a swap.
Why the Motorcraft 2100?
Originally found on Ford V8s, the Motorcraft 2100 (and its cousin, the 2150) is legendary for its simplicity. It has massive float bowls that prevent fuel starvation on steep inclines, making it perfect for off-roading. Best of all, it’s a direct bolt-on with a simple adapter plate.
Tuning for the 258
The key to making a V8 carburetor work on an inline-six is jetting. You’ll likely need to step down to #46 or #47 jets to prevent running rich. Once dialed in, the throttle response is crisp, and the idle is rock-steady.
Installation Tips
- Adapter: You need a 2-barrel to 2-barrel adapter (Mr. Gasket #1937 is a common choice).
- Linkage: The throttle linkage may need minor fabrication or a universal cable kit.
- Choke: Convert to an electric choke for reliable cold starts.
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