I am currently replacing the head gaskets on my 99 3100 sfi cutlass supreme and now need help identifying which valve is which (exhaust and intake) I have the intake manifolds put back on and now cannot tell which valve is which :-( The only thing I can find in any haynes or chilton manual tells me that the intake pushrods are longer and the exhaust rods are shorter...But not which valve is which, I need help, please!
-Brad

No one knows?

the exhaust valve will be smaller than the intake valve

look at the ports in the head, the exhaust valve will be on your exhaust port, your intake valve on your intake port.