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There are many things that can add you more power without needing that turbo. If you are "restoring" it to origional conditionyou may want to avoid adding it. I have a 64 4020 that was recently rebuilt, and is currently at 120 hp without a turbo. First, don't skimp on the head work. Valves and seats are a must. Find a machine shop that is knowledgeable in head work and have them do it right. Second, If your's is a 64, it has the big injectors. I didn't find the parts or do the work on mine, so I am not 100% sure of this, so here it goes. You can use injectors from (I believe) a 5010. They aren't cheap(I paid more than $100 each for these), and have a extra hole. Third, Think about a high compression piston and sleve kit. Sometimes refered to as the "predator kit". This will cost about the same as the origional John Deere kit, and will boost HP and cold starting. The kit I got came from A&I, which is owned by Deere now. Fourth, Injector pump. My pump was set up the way it is today when I bought this tractor, so I do not know what has been done to it. From what I have gathered, the plunger and governor springs can be changed or adjusted to give you the power you want. I know a bigger plunger can be used in your pump. Not sure what needs to be done with the springs or fuel settings. A couple other things to look at are the cam, timing and air filter. A new cam wouldn't hurt if it has a lot of hours(also check oil pump drive grars). Proper timing can really affect hp. Fuel needs air to burn. More air means you can burn more fuel(or at least produce power not just black smoke. Deere did make a paper filter that will flow more air than the oil bath system you probably have. There are 2 different models from newer 4020s that will work, one with a precleaner stack and one without. They will all fit in your 4020. Another option that I know I will get differing oppinions about is the use of a k&n filter. I have adapted a gutted oil bath air cleaner to fit a k&n filter. It looks stock, but does flow air a lot easier. Weather it cleans the air enough is where the oppinions come in. If you want to know more about the one I "made" ask and I will reply here. I think I covered everything I can think of, but I'm not a mechanic and I know other people here will have other good advice to add. Best of luck!
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