What kind of engine? Cam sprocket timing marks in head for timing belt relacement?
Only thing i could suggest is to put the number one cylinder at top dead center and fabricating your own timing pointer of some sort
I know swoop223! Unfortunately this is the case of "you get what you pay for", but in a price sensitive economy like ours, customers are usually not willing to pay for the OEM parts. They do know that these parts are not as the OEM, but need to know if there is a way around not having those markings on the cyl heads.
take it up with whoever is supplying YOU with these parts.
They should have made some type of reparations for the descrepancy in the form of documentation that comes along with the part.
If they did not.. SHAME on them
Make them do it or get your parts elsewhere if possible