Durango 5.9 Magnum R/T any advantage over any other 5.9 Magnum

273 said

There is some differences, mainly the head package and mainly the change from shaft mounted rockers to Chevy style. Which requires different oiling so magnum block can't oil LA heads but LA can oil Magnum heads with the right lifters and push rods. There's others like intake bolt angle, different balancing,

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some early magnum blocks had oiling passages for la heads, I have a 92 block with the passages for la head oiling
later blocks can be modified to oil la heads

lots of differences, gaskets, 10 bolt covers, valves, metric piston rings etc
original 92-93 RT engines had a better camshaft and larger diameter exhaust manifolds