Originally Posted by bigD
Haven’t been here in along time,does anyone know the required spring rates for MP p4349268 .620 mechanical cam. They say to use the p4876064 springs but don’t show any spring rates,just max. Lift. Thanks beer


The book says the 064 springs are 1.600" diameter to be installed at 1.86"-1.88" and have 146 seat pressure and 419 open pressure at a max lift of .640" and are made out of .216" wire.


2011 Drag Pak Challenger