Loud grinding noise: won't restart

I helped a friend put a purple cam in a hyd slant motor, we pulled the head, new chain yadda yadda, well he takes it out and runs it on a long 500 mile trip and poof...the oil pump gear gives taking the cam gear and oil psi with it, he spun all the rod bearings....

slants are so bullet proof, but the oil pump gear...is the achilles heel for all app's.