• To be used in S&S Sidewinder kits and Hot Set Up Kits for Evolution big twins with stock cylinder heads and 4-1/4″ and 4-1/2″ stroke engines with stock diameter (8-1/2″) flywheels and 4-3/4″ stroke engines with 8-1/4″ diameter flywheels
• Bore is 3-5/8″ + .020″



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