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SPEEDWERX 925 STEALTH BIG BORE KIT...
Kit comes complete with cylinder boring, porting and plating, custom pistons, base gaskets, our Stealth head mod kit with your choice of 13:1, 14:1 or 15:1 compression ratio inserts, and modification of your stock exhaust valves (our lightweight exhaust valves are also available).
Kit requires premium 91+ octane fuel.
NOTE: Your stock cylinders, exhaust valves, and head need to be sent in for exchange, parts are available for outright purchase at an additional cost.