I am a fan of the W series! I really have never built up any in line 4 cylinders like this,but My first step would be to have everything machined square,probably have the head milled,Have the block decked to get the MAXIMUM squeeze out of that compression.Reground camshaft.That aint too expensive.Something that is easily done at the "home garage" is smoothing out the ports in the manifold.
I would also be concerned as to getting more fuel to it also,but have not really ever worked with these at all.
I dont know how MUCH horsepower you are looking for,but we all know the MONEY is the ONLY limitations here!!!! You wanna buy a custom billet crank??? It can be had !!!!! Arias has made me custom pistons for Big Block Chevys my whole life.They will just as easily make them for my Farmall!!!! :)
I think in the future I will be experimenting with a 281 block to see what I can do with it???? I am not looking for a "record holder" engine,just a good power maker!
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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