The Purpose Of 1.6 Rockers

One small thing is the mass of lifter(s) and pushrod(s), more camlobe moves that mass more it robs hp(inertia), and the valvespring has to push that mass back. With 1.6 or 1.7 rockers you can use "smaller cam". For me its allthe same, but there is people that hunts for that last horse(kW).
13.5@111 el cheapo 4D -73 Dart 1580kg