fordracing65 Mufflers, camshaft profiles, high compression, and even tie bars for hydro roller lifters all can be heard. Motors with Webers when setup right can heard a sound pitch change when they clear out.
Are you looking for a nasty idle, Loud exhaust, or bug killer?? A little more info would help on the noise. Rick l. PS A solid camshaft and hydro roller camshaft don't have the same ramps for the profile and will give the motor a different tone with every else being the same. Hydro are really the way to go. I have run a set of crane hydro roller for 16 years and no problems with high
oil pressures. They run like solids if setup with min valve lash.