There is 4 exhaust and 8 inlet valves
Cast iron with Crome 25%
Lobes on camshaft spaced correctly
same direction and forward.
An inlet and exhaust valves are two separate things. The inlet valve lets the fuel/ air ,ix into the cylinder. The exhaust valve opens to let the pressure out after the mix has burned, releasing the gasses. Then the process starts over again.
A machine shop that rebuilds engines has equipment to regrind the valves and valve seats.
Inlet valves 0.010 inches (0.25mm) Exhaust valves 0.008 inches (0.20mm)
this is a mechanics job you have to remove inlet manifold,exhaust manifolds,and then remove heads to replace the valves
0.4 mm for exhaust valves and 0.35 for inlet
Three. Inlet valve, fuel injection valve, exhaust valve.
0.152mm or 0.006 inches on inlet and exhaust valves when engine cold.
On a fully assembled engine, the intake and exhaust valves will not be visible. If the cylinder head is removed from the engine, the valves will then be visible. The intake valve faces are usually larger than those of the exhaust valves, and can be easily distinguished visually.