[Chevelle-List] Engine breathers

[Jeff Bisnett]

Hi Guys   I'm a little confused I need some insight into engine breathers. I have a 67 327 motor. On the back of the block next to the distributor is a hole where a breather tube with a check valve went. I have been told it is a crank case breather ok fine. Now I was reading current Super Chevy Chevelle magazine there is an article called Basically Speaking about simple engine upgrades. Anyway they talk about a weird canister in the valley area that is an internal breather and if you install breathers in your valve cover you can discard this.   Now I do remember seen that canister and wondered what it was for. I do have valve cover breathers.   Is the internal canister breather part of the breather on the back of the block?   If not can I block the breather at the back of the block? As long as I have the breathers in the valve cover?   Thanks for the help!!!!!   Jeff