Several years ago, I did an FE engine build-up series for Mustang Illustrated Magazine. All the work was done in Roush's Prototype Engine Shop about two miles from my house and I parked my LS in the lot next to the shop every day while we were doing the work.
Gee, do you suppose that that makes my LS a Roush car? It was there every day! Don't you think SOMETHING must have rubbed off during all that time of being parked there?