Are you re-using the original bolts? Get some new ones. I know some guys say it's ok to re-use the old ones, I don't trust old fasteners knowing what kind of stress I have put on them. I know it is painful to come out of pocket even more, but worth the assurance of not having to do it again. I always put new head bolts on once they have been pulled off.
'72 Camaro<br />'69 350 40 Over<br />World Sportsman II