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These springs with over 500 pounds open load would quickly destroy most flat tappet cams, but a roller will handle the load with excellent longevity on the street. Spring load capacity is a critical limiting factor with a flat tappet. Steps such as EDM direct lifter oiling and nitride hardening of the cam will improve the situation. In lower rpm, lower lift applications with moderate spring loads on a flat tappet will provide excellent power output, service, and durability.