The 1GZ-FE engine uses a Variable intake Valve Timing - intelligent (VVT-i) system to control intake valve opening between 47° BTDC and 13° ATDC and intake valve closing between 3° ABDC and 63° ABDC. These "camshaft add-on's" provide improvements in performance, but are not able to take advantage of all the attributes of a fully variable valve (camless) engine.
LS7 - 482 grams (Gen 4 LS7 engine)
482-gram flat top aluminum piston
The 908 engine had chain-driven cams like a 911, unlike the smaller 8-cylinder 753/771 or 912 (917) engines. By the late 1960's, very few racing engines still ran chain-drive cams.
The Type 908 used a 3-litre flat-8 engine which was almost entirely new, though it used a few Type 906 racing engine components.