[topfuel67]

How much cam lift are the stock 6.1L SRT8 heads rated for? I see a lot of people spending money on upgraded their heads with aftermarket springs and retainers only to have those springs fail on even stock cams. Are the 6.1L springs safe to run most aftermarket cams? I realize an aftermarket cam voids the warranty and is difficult to say it is ok. Please include a disclaimer…this is for a crate motor with no warranty…Also, the mopar cam for the 392 (6.1 based) crate motor specifically states not for use with the stock pistons due to the valve clearance. Are the springs/retainers on the heads used on the 392s different than the 6.1?