Youtube videos dyno 318 magnum stock vs cam upgrade

They said you have to pull the heads off to pull out the roller lifters on a Magnum engine. You do not have to. I replaced mine (95 Dakota) without doing this. It's a tight fit with the head gaskets, but can be done fairly easy. I have over 200 miles on mine with NO problems at all.
yep, pulled the roller lifters out of my 5.9 with the heads on, no problem.