Like Hammer said, Engines fail and there's not many if any that warranty a race engine, I've ran stuff that should have never ran as fast as it did for as long as it did/Never failed, And Iv'e ran stuff with overkill components that you'd think would last and was junk in less then a 100 runs.
Even "IF" a engine builder warrants there engines component failure is excluded, I can mention one very faimiliar engine builder who's engine didn't even make a pass/rocker-arm broke in it & debris went through motor eating up the crank,so-on, Customer was told to call the manufacturer of the rockers (Crane golds) they sent him a two new sets of Crane rockers, He purchased two of these engines (540's) at the sametime so Crane gave him two new sets as they just made a Improvement on them going to a larger fulcrum, In other words they new they posed a problem, I have no problem mentioning Cranes name as it was total B.S. how they handled this matter :twisted:
Owner never Installed the One 540, Had the other one fixed and sold both of them as he was not too happy with the engine builder neither even though it was not there fault, Engine builder can only be at fault by throwing a engine together with wrong clearances,poor machining,Improper torqueing,etc. eveything else (maintenace is up to owner) Part failure has nothing to do with a engine builder regardless of runtime.
On a sidenote I'll never run Crane rockers nor roller lifters, Samething happened with a friends 427, freshened his 4 season old engine with Crane solid rollers after having no issues with his Huggins lifters, Warming engine up to break it in,Lifter broke taking out the cam and engine needing tore down for removle of debris.
I myself have also had 2 Crane solid flat tappets fail within the last 5yrs. one during break-in the other after 3 weekends of racing, I've run Bullet,Comp,Lunati and not one single issue to date.