COMP Cam's nylon thrust button is a little different twist on a cam button. It's easy to cut or grind to fit but has very good wear characteristics. We really like COMP's billet keyway adjustable timing set. The double-roller chain is pre-stretched and heat-treated, the gears are machined from billet steel, and the top gear has an integrated Torrington roller thrust bearing for reduced friction and wear against the block. Degreeing the cam is easy with the nine keyway sprocket. In steps of 2 degrees, you can advance or retard the camshaft a maximum of 8 degrees.