stock bores have a metal matrix liner cast into them. Bore that out, press these in, deck the sleeves to match the block, bore and finish the sleeves to fit for your choice of pistons.
From the "FA20 Engine Mechanical - Engine Unit - Details (2013 FR-S)" doc from toyota:
Quote:
(4) A compact block has been achieved by producing the thin cast-iron liners and cylinder block
sub-assembly as a unit. It is not possible to rebore a block which uses this type of liner.
(5) The liners are a undercut-type, which have been manufactured so that their casting exterior
forms a large irregular surface in order to enhance the adhesion between the liners and the
aluminum cylinder block sub-assembly. The enhanced adhesion helps improve heat dissipation, resulting in a lower overall temperature and reduced heat deformation of the cylinder bores.
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