I have solid lifters in my engine.I started getting a lot of valve lash on number 8 intake valve. I took it apart and found that the pushrod wore a hole in the solid lifter cup. The pushrod tip is not worn at all. What caused the pushrod tip to wear through the lifter cup? The faces of the lifters are perfect.The engine has less than 4,000 miles. I will try to post pictures later.