Quote:
Originally Posted by cab4word67
OK I recently built a ford 289 / 480 lift and after snapping off 4 of my studs in a total of 60 miles I found I had spring bind. Check your adjustment. If adjusting cold make sure you can spin the push rods when the valves are closed. If you adjusted while running its just past clatter then 1/2 turn, and before you pull the head make sure you can get a feeler gauge in between the springs when at full lift (about 5-10K). You are ether to tight or lifting more than the valve can go down.
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Thank you cab4word67 and Carl Spangler for the helpful (and encouraging) suggestions. I guess I will be learning about replacing the stud in place as well as investigating the root cause.
My cam is a COMP cams CS 268H-10 grind which has a valve lift with factory rocker arm ratio of 0.454 int./0.454 exh.
I also installed the COMP recommended 981 valve springs which have a bind height of 1.150in.
Edit: Forgot to mention that it is a 220HP 327ci with factory heads.