[markjohnson]

That's the exact cam that came out of my 1970 LS-6. The lift is actually the same as the #143 camshaft. The .520 specification includes the lash. Subtract the lash figure and its' back down to right around .500 lift. I'm sure there's better, more modern camshafts out there, but I used to run 11.80's with mine with a really nice idle quality and good valvetrain reliability. In fact, it really doesn't sound like much of a camshaft, doesn't really thump very hard at all and I was always tempted to change it out until I'd give it hell on the service road in front of my house. Then I'd remember why I left it alone!