LA/Magnum combo

Minella, I hope this info helps you: " had purchased a set of heads from a boneyard and decided to make this conversion.
I bought the appropriate retainer(P4452032) and went with the high lift spring (P4876062)
However, with the casting of my head was off such that the install height was only 1.60" instead of the recommended 1.64" height. This made spring seat pressure with the purchased spring being 149lbs.
Then I purchased and tried the weaker medium lift spring which was near the limit of my cam I was using. (0.520 Lift)
However at the 1.60"install height the seat pressure was still a whopping 139 lbs. Way too much for a hydraulic cam.
So in searching for another solution I wound up going with Crane as it appears to be the onlyother alternative.
Part numbers are:99840 for the spring and 99947 for the retainer. Using the MP locks as the 8mm valves are radial groove and not square groove.
This gives a install height of 1.58" which gives a seat pressure of 108 lbs. I did have to grind the guide some to get a proper clearance of seal/retainer, but wasn't expensive to get done. So, this is a solution for those that have poor castings that aren't to mopars supposed specifications" Good Luck!!