1) It is not possible to open a modern silver can motor and put it back together without it being very obvious. Period.
2) It is not possible to crank a modern silver can motor (advance the timing) without killing it due to the cam lock installed when it is manufactured. Period.
3) It is possible to advance the timing slightly on a modern silver can motor using a magnet zapper, but while RPM goes up, torque goes waaaaaay down.
Take it from someone who's been there for a long time (check out the avatar): if you want a fast silver can motor, buy A LOT OF THEM, test them all, water dip and break in the fastest ones, and sell the rest to the kids in the neighborhood. Ask pretty much anyone in TCS: my silver cans ROCK...and they are legal. Including the amp draw thing.