If you want to know, ask Denny, he is on everything2stroke. I want him to do my motor. He has done my blaster last year, but I went in for training and had kids I'm still building. He does a great job comunicating. He rounds shift stars m lightened flywheels too. I trust his work and respect his artwork. For boasters n banshees he is an expert. He had an LT before idk if he still do but I know he will do good work and will try to give you what you want, depends on pipe carb riding style and gas you use. That's what makes your engine nice to port specs. If you miss those then you will be stealing the potential power your bike has to show you.