This is a bolt on kit with no machining required.  It will work with your stock head, and the piston uses pump or race gas.  Everything is new in the original packaging and the manufacturers warranty applies*.

Please check your order thoroughly when you receive it and if you have any issues at all contact us right away so we can help to fix them.  If you are not 100% happy with what you receive you are welcome to return it (PRIOR TO INSTALLATION) for a full refund, no questions asked.

*We recommend that this kit be installed by a qualified mechanic with experience working on these types of motors.  Piston comes with specific instructions for setting ring gap.  If you do not follow these instructions your motor will fail.  Warranty does not cover any failure that is a result of improper installation, improper tuning, improper break in, or misuse.  For any warranty to be considered the part(s) in question must first be sent to us for inspection.  We can not warranty parts based on phone calls or photos alone.