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The answer to this question is yes and no. The 1974 Beetle engine is a carbureted dual port 1600. The 1979 engine has the AFC fuel injection system. This is an air flow control engine with electronic fuel injection. Now here is what I know about all of this. Many people have performed this swap, there are a number of small electrical changes necessary to do the swap, but it is fairly simple and straightforward. The reason that you are not supposed to make this change, is more of a legal or environmental issue. The US EPA has mandated that all motor vehicles meet or exceed certain emissions standards, these standards changed pretty much every year. There were several big "cuts" in allowable emissions, these were for year model 1975, and then again for year model 1980. The cuts in allowable HC emissions for the 1975 models resulted in many car companies changing over to a fuel injection system from the carburetors of old. Quite simply, VW made this change to allow them to meet the 1975 emissions levels. Standard Beetles were manufactured for sale in the USA up through 1977 (I was in high school and working as a mechanic in a VW dealership at the time). The air cooled VW engine soldiered on in the "Super Beetle Convertible" for the US market until production ceased for US market Beetles at the end of 1979. The 1980 emissions standards were simply too tough to meet with an air cooled engine. While in college 1977-1981, I was a member and student section president of our SAE section (Society of Automotive Engineers), and did some extra-curricular stuff with alcohol powered machines for alternative fuels, and emissions, so I got to know quite a bit about all of these laws and mandates. The real answer to this question, is whether or not your particular state tests for emissions on 1979 vehicles. Texas cuts this off for anything made prior to 1980, so you could probably do this in Texas today and get the car licensed inspected and street legal. While technically illegal, still subject to some pretty onerous fines, you would likely get away with it, as the EPA does not spend a whole lot of time going around to check tailpipe emissions on "1979 Bugs", there are just not that many of them out there. On the other hand, other states may have more restrictions on what is allowable for vehicle inspection and licensing.

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Q: Can you replace a 1979 beetle engine with a 1974 one?
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