Was just typing what D&J said. Oil has a lot to do with helping wear, but once you get enough spring pressure, and rpm, the cam could touch the block. Also when you start the engine there isn't always oil pressure at the cam right away. That is also part of the problem. I basically tell people I have seen some guys get away with out the cam bearings, but I have seen some really tore up cam tunnels even on a cast cam. So it is your risk. Is the time and money you could save to not to put in cam bushings, worth a wrecked cam, the time to take it apart when you need the engine to run, and possibly a wrecked block. That is what your betting on. Be careful to fall into the idea that you can just run less spring pressure. You need enough to keep the valvetrain stable or else you are causing other problems. I recommend cam bushings. Even when I get a build to come in even for 500 - 600hp, I know down the road this person may want to go bigger. We bush the block right away. Its done, and we don't have to worry about it. He can keep upgrading with out having to tear down the whole engine again.
