With the intake manifold still installed, how can I find the base circle of the cam lobe of #1 cylinder without a dial indicator. SBC 350
Laser Red Nova, my reply above is the very method I use to find the base circle of the cam INCLUDING when I do rocker geometry or for whatever reason you need to be on the base circle. Your question has been answered....
Are you asking how to determine the diameter of the cam's base circle (small base circle cam vs normal base circle cam)?With the intake manifold still installed, how can I find the base circle of the cam lobe of #1 cylinder without a dial indicator. SBC 350
I assume you are looking to adjust or set valve lash. Below is a very simple method for any engine not just a Chevrolet.
First, keep in mind that the exhaust valve always opens first followed by the intake valve. Picture a "W" if you will for lobe layout of a camshaft....
To find the base circle of the intake intake lobe: Rotate engine in the standard rotation so the exhaust valve of that same cylinder just starts to open.
To find the base circle of the exhaust lobe: rotate engine following the intake of that same cylinder as it opens, moves over the nose and almost closes, that will be the base circle of the exhaust lobe.
Pretty simple and as you follow the valves you will start to see their relationships and the overlap period. Pretty cool stuff....