Best way to flush engine after rocker arm failure?

That is my question too, I torqued the bolts down, rotated the engine and re-torqued the bolts, And for good measure did it again. This time I am going to use some red Loctite on them and let them set overnight.

Most of the participles are aluminum so the magnet will be of now use in this application. The oil has a slight metallic tint to it. After I get the replacement parts I will re clean the head and blow them off with compressed air.

This has me worried as to what is going on.
Those shafts are pretty hard and I'm not sure if it's possible with a regular bolt.. but maybe with an arp ... you cracked by it over torquing it.