If you have Box Stock Engine built according to Box Stock Rules and want to upgrade to the more powerful Superbox Class, this kit contains the new parts you need:

Kit includes:

6270 ARC Billet Connecting Rod with bearing inserts
6619 ARC SFI Certified Billet Flywheel
RLV Superbox Spec Header, Muffler, and clamp
DJ-1110 Superbox .275 Cam
Springs, Retainers, and Keepers (2 sets)
DJ-1246 .036" Jet
DJ-1251 140 E-tube

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