Do you have an aftermarket cam with those springs? There was a problem YEARS ago with 6.1 springs breaking due to a change in production.

http://www.lxforums.com/board/f71/failures-oem-6-1-valve-springs-157415/

Swap them for a set of PAC 1235 if you've got an aftermarket cam now that you can. There is a Miller tool just for this purpose, but it really is a 2 person job.

http://www.racingsprings.com/1200%20Series/PAC-1235/item/211


My Build thread: Let the hemi swap begin!

1968 wanna be pro touring whatchamacallit with some fancy stuff and a new roof skin.