1968 383 stock cam specs

Darren,

Valve Springs

Compu-Cams.....#911-16...........{#122 lbs. Valve-Closed ~ #309 lbs. Valve-Open}
or
Mopar Performance...#P3690933

Are nearly identical in Load-Rate Spring Pressure.

Both are designed for Hydraulic Camshafts with Lifts between .450" and .500"