Need Info on builds

[hunt3rm008]

What does going to a 4mill or 10 mill actually do? I know it's a different crank but what specifically changes? Do you have to change the cylinders or pistons? Can you run a 4mill on a stock top end? What are the performance advantages when going 4mill or higher

[Wildcardracing]

Increased crank stroke gives you a displacement and leverage advantage. Stroker motors if properly setup will have more hp and torque than the same build in a shorter stroke. 4mil cranks "can" be run without modification to the cylinders with the use of a spacer plate. However, the preffered method is to have the cylinders ported for the new stroke and use custom cut domes. Using a 10 mil crank would require extensive modification to stock cylinders if you can find a willing builder. I offer Stock stroke through +7 with stock cylinders. Any more than +4 stroke requires case modifications.