Also remember that the B18C5 Type R engine has been port polished from the factory. The internals are lightened, hardened, balanced and matched (rod to piston, and assemble to position on the crankshaft). Piston skirts are Moly coated too! Basically it is internal work done from the factory!
Plus, there are other stuff that is difficult to put in on a VTiR engine, such as oil cooler jets to the top of the piston.
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