Foreign valve springs in a Magnum

well from what I've read stock LS1 valve springs aren't anything to get excited about. I was looking for a cheap set of beehive springs for a project and LS1 springs popped up and they don't have much pressure IMO. I realize beehives work with lower pressure but they were only about 85 lbs. on the seat and 205 open. At least that's what the website I was on showed. To know if the springs are sufficient for your cam just look on the cam card and see what pressure's it requires.

Magnum engines never used adjustable rocker arms so I'm not sure what Mancini's is calling stock OEM replacements that were adjustable? If I'm not mistaken the only SB Mopars that used adjustable rockers were solid cammed 273's and 340 T/A engines. What size is the bolt you broke off? If your referring too the stock magnum 5/16" rocker hold down bolt something was drastically wrong if 21 ft. lbs broke it. For that matter most rocker arm adjusters are 5/16" and should be strong enough to handle 21 ft. lbs. of torque, providing your torque wrench is calibrated correctly.