it means the higher compression version of the 1uz which was introduced in the 95 ls400 and 96 sc400, the compression is bumped to 10.4 along with other minor changes. I have driven sc400's with both and there is a noticable difference, also the idle seems abit smoother on the later engine, at idle the exhuast note seemed to have no pulsation, just sounded like a solid tone. they dyno about 20rwhp more than the 90-94 version so that's about 25hp more at the crank.
Is it just a slightly higher cam lift between the two motors... I would like to exactly how compression varies between the two motors and how the changes were made...
If anyone can quickly explain how they differ I would appreciate it....
different pistons and rods homie! also slightly different cams as you mentioned, but that has no effect on compression. and the difference, 10:1 for the early motors, 10.4:1 for the 95-97 motors = 25 hp extra, that's as good as an entire header, exhaust system on an earlier motor, then you can still do it and gain even more.
Is it just a slightly higher cam lift between the two motors... I would like to exactly how compression varies between the two motors and how the changes were made...
If anyone can quickly explain how they differ I would appreciate it....