Magnum Performance Valve Springs P5249464 P4876062

I had Dwayne of Porter Racing Heads install a set of 6062 springs in my EQ heads that I needed redone for a stroker 318/390 LA-based roller engine. Here is what he told me "the springs, retainers and locks fit perfect and at 1.630 installed height. I have coil bind after 1.300 travel so plenty of room for cam lift of .524". Spring rates are 130 lbs closed and 325 lbs open which good for the Lunati cam per their tech people. After the completion of the heads these were the final specs: springs are 1.57 final installed height, spring pressure is 155lbs closed and 320 lbs open. I am using Sealed Power Magnum replacements lifters and Mopar factory replacement rockers for a Magnum, etc. I haven't fired her up yet. Also here is an article that may help you decide as well : The Forgotten Valve Spring | Mopar Magazine