im doing this now, using a 2.5l phase 1 shortblock with 2.2l heads with were completly rebuilt and are basically brand new, 2.2l intake, 2.5l injectors, diamond coil. i am trying a phase 2 sohc head gasket with it modifided to the 2.2l head, now rough measurement, stock 2.2l gasket=1.8mm, 2.5l P2 gasket=07mm, so will there be any interferance?(valve to piston), this will also raise compression , right?, (premium Fuel), and i am wondering how the stock 92 2.2l ECU will handle it?