VG-15K Hi-Rev Kit for Briggs Vanguard V-Twin will raise the rpm limit of your stock engine. 

The hi-rev kit will stiffer the stock springs by using shims to change the install height, which helps prevent the valves from floating. We also added a timing advance key to increase power at the raised RPMs. To add more durability, we send two steel pushrods to replace the aluminum one in your engine. 

Use with a stock cam only.

Target RPM 5,000