by 
The Curious Bag
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"There's no replacement for displacement," or so the old saying goes. By installing a crankshaft with a longer stroke, the engine builder can increase an engine's effective size without increasing its outer dimensions.
Rotaing Assembly
An engine's rotating assembly is comprised of pistons, rods and a crankshaft. The crankshaft is connected to the rods and, when rotated, causes the pistons on the other end to travel up and down in the cylinder bores.
Stroker Cranks and Displacement
When multiplied by its outer diameter, the distance a piston travels within its cylinder determines the intake capacity of the engine. Stroker cranks allow the piston to travel further into and out of the cylinder.
Dispacement Power
The more air an engine can inhale, the more fuel it can burn and the more power it will make. Stroker motors will generally make power and torque in the exact same way as a non-stroked engine, but there will be more of it all across the board.
Common Strokers
By far, the most common stroker motor is the Chevrolet 383, which uses a 350 block and a 400 crank and rods. Others include the Ford 347 (up from 302 cubic inches), and the Chevy 502 (originally 454 cubic inches.)
Drawbacks
A properly engineered stroker motor has no real drawbacks. Hack jobs, though, can cause overheating, oiling problems, a decrease in engine life all while failing to deliver on the power potential of their size.
Source:
Resource:
1000 Horsepower N/A 433ci Stroker (Video)
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