Did Hyundai engine have flat tappets?

Yes, some Hyundai engines, particularly older models, utilized flat tappets in their valve train design. Flat tappets were more common in older engine designs but have largely been replaced by roller tappets in modern engines due to improved performance and reduced wear. If you're looking for specifics about a particular Hyundai model or engine, it's best to consult the manufacturer's specifications or service manuals for detailed information.