What type of performance increase does a 4 mil stroker give?

[Jayy]

I know there are different stroke mods available (4mil, 10 mil, etc.) but 4 mil seems to be the most popular. I know it is also strongly recommended you have your crank trued and welded for this mod. What is the performance increase? More power everywhere, or topend, etc? Thanks for the knowledge, the stroker concept is new to me and I have never really heard it explained.

[jbooker82]

A stroker crank makes the distance from the center of the crank shaft to the center of the big end of the crank shaft longer. If you have a tight bolt that you cant get with a normal wrench. So you go get a pice of pipe or cheater to make the wrench longer and the bolt comes appart easly. That is the same think. By making that distance greater it gives the pistons more leverage.

 

The 4 mill stroker allows the piston to fall 2mm down in to the cylinder and it goes up 2mm more than the stock stroke crank. That increases displacement.

 

The 4 mill is the most popular because you can drop it right in. You dont have to have the cases trenched to clear the conecting rods.

 

A stroker crank is most noticable in the mid range. It helps add torque.