I had a problem where I wasn't getting much oil to my rockers and they were pretty noisy like that. The rear connection of the oil supply tube that is located behind the pushrod cover was completely blocked with crud. Here is a picture:

[IMG]http://i7.photobucket.com/albums/y261/bohon/56%20Chevy%20truck/Blockage019.jpg[/IMG]

Here is the same hole after cleaning:

[IMG]http://i7.photobucket.com/albums/y261/bohon/56%20Chevy%20truck/Blockage021.jpg[/IMG]


1956 Chevy 3200