i put a new set of heads on my 99 silverado 4 by 4 5.7 and one rocker stud pulled half way out how do i fix tis problem

 

Two pound ball and peen hammer. Or pull the head back off, and return it.

 

to fix them right you will have to remove them and take them to a machine shoop and have
either ovewr size press in stud's in or better yet screw in stud's installed . and figure out why yoy pulled the stud's on the new head's before you start it ,cam shaft lift push rod length .rocker arm's ect .

 

A good machinist can do this without removing the head. He can install a Helicoil or a steel insert.

 

yes if you are careful you can replace 1 maybe 2 but the chance of getting metal fragment's down in the engine to wipe out the bearing's is great ,when you dont haveany room to manuver and keep th particle's from falling down inside .i have done it both way's .

 

Naturally you would have to be very careful.