[elmariachi]

Today's production cars are not hand built, they are mass produced and prior to that, they are scientifically engineered. So to compare the design and assembly tolerances of a 427 stroker to a Benz 5.5L is not fair. In my opinion (and I ain't no engine builder) anyone who buys a performance engine for these cars, from Roush or anyone else, should err on the side of caution and check things like head and valve train torque.

And your last sentence is most important: With these engines being hand-built, the chance for assembly error is astronomically higher vs an assembly line engine. Why not insure yourself by checking?