If you're driving and enjoying a 1983-85 Mustang GT with four-barrel carburetion (four-speeds only), here's something you should know.
If you own a Fox classic Mustang GT from the early to mid-1980s, it is important to understand though your Holley 4180 may look like a traditional Holley 4150/4160 carburetor, there are differences that set it apart from the popular Holley four-holers. Ford and Holley engineers worked together to achieve characteristics that made traditional Holley carburetors popular while pursuing cleaner exhaust emissions. Getting both was never easy.
Here's what makes the Holley 4180 different than the 1850/4150/4160.
* Idle and Main Metering Circuits are different.
* Metering block is different and not interchangeable with 1850/4150/4160.
* Air Mixture screws are sealed and tamper proof. They're also located in the base plate instead of metering block.
* Minor modifications to the secondary side will enable you to install a 4150 metering block.
* Center pivot fuel bowl installation is possible.
* Non-adjustable electric choke on 4180.
* Power valve and jets are interchangeable with 1850/4150/4160.
* The 4180 has a different fuel inlet than 1850/4150/4160.
For more information, key Holley 4180 into your Mustang Monthly search engine.