I just got a '73 Corvette with a 454 that the last owner put in a 280* Comp cam. It has pop out of the drivers side sidepipe and was wondering if i can adjust the the rockers or are they just tightend to a certain torque setting? It sounds like one is too tight and i want to adjust all of them to zero lash. Will i need polylock nuts to do this? Thanks, Todd.