4age20v till 1996 was silvertop. later in 1997 black head engine came was called black top.
physical size difference,, hardly any..
techinical .. yes a few diffirent ecu. map sensored like your 4afe corolla instead of afm which was in silvertop.
internal design , compression ratio increased from 10.5:1 to 11:1 , lighter piston rods etc,, gain of 5 horsepower. from 160 hp to 165hp
how come you have seen me, and i havent met you?