I play in the gncc races an the last race I did hurt the top end and scored my rod. The rule books states that engine mods are aloud so I bought this crank and installed it. Another racer told me you can not add displacement because it's a production class. So I called racer production and they said what I didn't want to hear. So I bought a oem crank. Long story short, you won't be disappointed in this crank. I have 2 rides around my place with it and pulled it out.