uhhh....Stroker?

[RedPonyGT]

What are you doing when you stroke an engine? How does it benefit it?
:Stick: forgive me if I am annoying you vets.

 

[96Bluovl]

making the stroke longer via different crank.

 

[JoeySperz]

Like 96BluOvl said, It extends your stroke via the crankshaft. You benefit because you get more cubic inches by doing this. This is usually done along with a bore (hence boring and stroking an engine). Increased displacement = Increased horsepower. Also, you will usually put in a forged crank/rods/pistons when doing this, which enables your bottom end to be stronger and hold more horsepower.