OK,I'm dumb here! Just what in the hell is the diff between a 5.9 magnum and a 5.9 LA??????Hell I thought they were the same just more punch in the magnum!
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,