I ran Zmax in my 8 second Falcon once break-in was done. I had a faulty SVO oil pump that blew the bypass into the oilpan and dropped to 0 oil pressure half way thru a run @ 7200rpm. Shut it down by the time I went thru the traps. Got it home and tore the 514 down, Damn-no damage to the inserts. None whatsoever!! I am a firm believer in that stuff!! I will be using it in the 383 after break-in. Once I get the turbo I will be soaking the center section in Zmax after I heat it up with my map torch. I will break it in with Castrol 40 then change to Royal Purple with a bottle of Zmax and it should be ready to go!!!
Believe me!!! It WORKS!!!