A rocker arm, comprising: a forked outer arm assembly comprising a valve side, a pivot side, a pivot side body connecting a first outer arm and a second outer arm, respective bearing holes in the valve side of each of the first outer arm and the second outer arm, and respective pockets through each of the first outer arm and the second outer arm, the respective pockets formed near the pivot side body; an inner arm assembly comprising a valve side, a latch side, a latch body on the latch side, a latch seat on the latch body, a first inner arm and a second inner arm extending away from the latch body to the valve side, respective bearing holes on the valve side of the first and second inner arms, and an inner arm extension bar comprising inner arm extensions (2760, 2750) extending through the pockets in the outer arm assembly; a pivot axle connecting the bearing holes of the first outer arm and the second outer arm with the bearing holes of the first and second inner arms (2770, 2780) so that the inner arm assembly is configured to pivot with respect to the outer arm assembly; and a latch assembly mounted in the pivot side body, the latch assembly comprising a latch configured to selectively extend to and retract from the latch seat to selectively lock the inner arm assembly with respect to the outer arm assembly or unlock the inner arm assembly to pivot within the outer arm assembly; and a torsion spring ( 803, 804) mounted to the pivot side body, the torsion spring comprising a first end biased against a pin or shelf on the pivot side body, and the torsion spring comprising an extended leg biased against one of the inner arm extensions (2760, 2750) extending through one of the pockets in the outer arm assembly, characterized in that the inner arm assembly further comprises respective drop arms (2778, 2788) extending down from the first and second inner arms (2770, 2780), wherein the drop arms span between the first and second inner arms and the inner arm extension bar. a forked outer arm assembly comprising a valve side, a pivot side, a pivot side body connecting a first outer arm and a second outer arm, respective bearing holes in the valve side of each of the first outer arm and the second outer arm, and respective pockets through each of the first outer arm and the second outer arm, the respective pockets formed near the pivot side body; an inner arm assembly comprising a valve side, a latch side, a latch body on the latch side, a latch seat on the latch body, a first inner arm and a second inner arm extending away from the latch body to the valve side, respective bearing holes on the valve side of the first and second inner arms, and an inner arm extension bar comprising inner arm extensions (2760, 2750) extending through the pockets in the outer arm assembly; a pivot axle connecting the bearing holes of the first outer arm and the second outer arm with the bearing holes of the first and second inner arms (2770, 2780) so that the inner arm assembly is configured to pivot with respect to the outer arm assembly; and a latch assembly mounted in the pivot side body, the latch assembly comprising a latch configured to selectively extend to and retract from the latch seat to selectively lock the inner arm assembly with respect to the outer arm assembly or unlock the inner arm assembly to pivot within the outer arm assembly; and a torsion spring ( 803, 804) mounted to the pivot side body, the torsion spring comprising a first end biased against a pin or shelf on the pivot side body, and the torsion spring comprising an extended leg biased against one of the inner arm extensions (2760, 2750) extending through one of the pockets in the outer arm assembly, characterized in that the inner arm assembly further comprises respective drop arms (2778, 2788) extending down from the first and second inner arms (2770, 2780), wherein the drop arms span between the first and second inner arms and the inner arm extension bar.