Personaly have seen WAY too many injection / Head issues.
Youd think building dozens of D-max's a year I could agree but I digress. Yes we have an aluminum hardness tester. We also innovated LB7 "screw in" injector cups. Its all filtration LLY 2004
Have fun with with the cracked heads & lovely injectors . I also do all the magging. 1 set I've seen "not" cracked 7.3 anyway. Did I sat we dont build ford. Dmax & Cummins only
I know I sound like an asshole but your 5.3 was a better plan. Really though your fun