I just found the original specifications for the valve spring pressures for my '72 440-4bbl engine. These spring pressures don't seem that high to me so I was wondering what everyone thought for oil. I have been using HDEO. At these pressures do I need the extra zinc ZDDP protection?
INTAKE & EXHAUST VALVE SPRING PRESSURE: 234 LB/IN, INTAKE LIFT .449, EXHASUT LIFT .464. FOR REFERENCE, THE 440-SIX PACK HAD 310 LB/IN AND THE SAME LIFT. THANKS!
INTAKE & EXHAUST VALVE SPRING PRESSURE: 234 LB/IN, INTAKE LIFT .449, EXHASUT LIFT .464. FOR REFERENCE, THE 440-SIX PACK HAD 310 LB/IN AND THE SAME LIFT. THANKS!