1.9 inch stroke is not moving the piston any faster at 14,000 than a 3.8 stroke at 7000

But the peak piston acceleration is much, much higher: Z (in feet per second, per second acceleration) = (N^2 × S (1 + (1 ÷ 2n))) ÷ 2189
(assuming 2:1 rod ratio for both engines)
1.9" stroke @ 14,000 RPM: 212,654 f/s/s
3.8" stroke @ 7,000 RPM: 106,327 f/s/s

Many current DOHC auto engines have variable valve timing, which uses... rocker arms. 2JZ (Supra) owners don't seem to understand what that is.