Are the 2.02 valve's to big for a 318? I don't want a valve to kill off the bottom end. I'm building my engine for throttle response and low to midrange torque and power
Valve size has nothing to do with bottom end or anything else. Clear your mind of “bottom end” because if you don’t you’ll end up with something you don’t want. Cam timing is critical. As worried as you are, I would never suggest an off the shelf cam. You can miss on the heads, miss on the manifold and carb and still be ok, but miss on cam timing and you’ll know it.