I`m not so sure that its a matter of viabration, as much as a matter of flex, expansion ect....
aluminum motor is gonna expand/contract just a hair, steel frame is gonna do the same but at a differant rate/amount, stainless steel hard lines are gonna expand/contract at yet another differant rate/amount, Plus... frame may also flex just a hair under load ect, tweaking your lines ever so slightly where you cant even see, feel, or other wise detect it..

this VERY VERY tiny bit of movement/flexing in them lines, may eventually cause the lines to develope hair line cranks/splits followed by all out puring of oil....which none of us like..lol..

74rat

when in doubt..knock`um out...(or wish ya had later!!)...H.C.C.M.F LOCAL 6978

Flint Michigan..most dangerous city in the USA..come back and visit us..sorry we "missed" you the first time..LOL
"Flint 'Vehicle City' Now America's Murder City"

Officially #1..
http://finance.yahoo.com/family-home/article/112804/most-dangerous-cities-247