Re: new cams
Nothing bad should happen assuming you don't contact a piston.. valve springs will probably float, also and should be replaced..
Oh and don't expect too much return if you have even stock exhaust, and non PI heads...
If you're going through the expense and hassle of doing cams.. skip 'em and just go with a set of 99+ GT PI heads... I can about guarantee you'd get a better return off of those than just doing cams on a mostly stock motor..
2012 IS F Blue IS F Sport
2006 Mustang V6 wannabe