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Project EFI GT
Mustangs Plus gives you the lowdown on installing
Electronic Fuel Injection in an Early Mustang
page1If you have read any of our past Newsletters, you
know that Mustangs Plus has been working on Project EFI. Project EFI is the installation
of an early 1990's Electronic Fuel Injection set up on a stock 1966 Mustang GT Coupe with
the original 289 engine and 4-speed transmission. The reason we chose to do this project
is because we receive many calls each week from customers wanting information on
installing newer engines, which are equipped with EFI, into their early Mustangs. So,
being the "hands on" type, we decided that in order to give our customers the
best possible information, we should do our own conversion and then we would have the
correct answers. So, with the help and expertise of Ron Morris Jr., we started and
concluded the project. It was a great success which taught us a lot.
One of the biggest concerns that we hear about EFI is the cost. In all
cases until now, to get EFI you also had to change the engine and transmission. So we
chose to add EFI to an already running car with the 289 engine and factory 4-speed
transmission. This, we reasoned, would take a lot of the cost away from doing the
conversion and interest many people who already had a good running Mustang but wanted to
have an EFI Classic Mustang.
Adding EFI to an early engine brought two concerns to light, but
neither turned into problems. The first was that the water passages on the EFI intake
manifold and the original heads were of different sizes. We went ahead and installed the
intake on the stock 289 engine and have run it for several hundred miles with no problems.
Still, if you do this conversion, you'll want to keep this in mind.
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