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There are really no camshaft restrictions in this year's challenge as either roller or flat-tappet cams are allowed. Lifters must be .904-inch diameter, the same as factory lifters, and ceramic lifters will not be allowed. The cam must be driven mechanically by either a timing chain or geardrive, with no beltdrives allowed. Otherwise, specifications such as lift, duration, and lobe separation will be left to the individual engine builders.