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Tappets from my 2003 Hydro.
Heck, the na$car boys used flat lifters until a couple years ago. They had crazy cam profiles and spun the things to 9k rpm all day long with no problems.It ain't rocket science.
I know that some racers have run flat tappet cams successfully for years, and that NASCAR Nextel Cup teams are required by the rules to use flat tappets. The former are very fortunate, while the latter spend mountains of money on special cam cores made from exotic alloys, hardened and inlaid lobe faces, oversize zero-radius lifters, camshaft oilers and major block modifications to eke out 500 miles of racing from a flat tappet cam before it self-destructs. Flat tappets don’t save money for NASCAR teams – in fact, the total cost far exceeds the price of a roller cam and lifters. Moreover, the highly specialized components and machining procedures used in NASCAR Nextel Cup engines have virtually nothing in common with the flat tappet cams listed in retail catalogs.