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Many mistakenly believe the BRZ and WRX versions of the FA20 to be similar with the exception of compression ratio and the presence of a turbocharger. In reality, the differences are vast including the block, heads, pistons, rods, valves, camshafts and oil pumps. Most parts will not interchange.
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It may seem cheaper to buy a FA24F block instead of boring out the FA20D block, but it might make for less headaches. I would really reach out to a builder.