Youtube videos dyno 318 magnum stock vs cam upgrade

niceolddart said
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.

If you get tricky you can also pull the cam first and change the lifters by "carefull" dropping them down, then pulling them back up through the casting holes. I did this on one I tore down ---there was enough varnish that several lifters would not pull out the top