valve lash stx-21 cam

Since no one has chimed in yet, i'll just say that the few Racer Brown cams I used, along with a lot of the older cams, used a pretty wide spec compared with some modern grinds.

Assuming your using iron heads, i'd look at .022 int & .026 ext as a decent starting point. Should be a safe spec at first, and you can adjust a few number up/down depending on how it sounds/runs.