Are there any identification marks that identify a 2.0litre Pinto cylinder head from a 1.6 litre cylinder head, or failing that any other method

Turn it upside down with the valves shut, pour fluid in to the chamber, 38cc it's a 1600, 48cc 2.0l
If it's unleaded there are letters stamped near no.4 exhaust or no 1 inlet can't remember rr is 2.0 LL i think is 1600

mesure the diamiter of the valves

1.6 are:
42.1mm inlet
34.5mm exhaust

2.0 are:
42.1mm inlet
36.2mm exhaust