(27mm / 25mm OEM Head Diameter )

These Valves will create a tighter spring installed height. They will 

add approx .062 more load on the springs which in turn allow for more RPM's before valve float.. 

Actual RPM gain will vary depending on carburetor quality.. On average it raises the power band (usable RPM's) by 200-300 over whats supplied from Factory.. These valves are  a perfect fit,, as well as looks etc.. Under normal tech situations they will pass right through tech...

We have a small quantity at this time... On this first batch the prices were higher than we wanted.. If they sell good then we will buy larger quantities and we will drop prices on future batches.. Unless the New Tariffs run the price up..

These Valves are designed for the Pure Stock (Box Stock) Predator Class where you are suppose to be running ONLY OEM stock parts,,springs,,carb,,valves etc etc..