A Stroker kit is an aftermarket assembly that increases the displacement of a reciprocating engine by increasing the travel of the piston (that is, the piston moves further up and/or down in the cylinder). This is done by using a different crankshaft where the crank pin is moved further away from the center of the axis of rotation of the crankshaft. While this increases displacement and torque it can potentially lower the limit to which the motor can rev safely compared to the stock configuration.


  • Select as long as a rod as possible to minimize the frictional losses from side loading and cut the engine’s mechanical noise.
  • Select the lightest reciprocating components for the bottom end.
  • Use an effective crank damper
  • Use an oil pan that keeps the oil away from the bottom end rotating assembly as entertainment will cost big power and may lead to failure.
  • Go for as high a compression ratio as possible as it will off-set the engine’s reduced mechanical efficiency due to it’s greater piston friction.
  • Use cylinders heads with valves as large as possible as there are a lot more cubes to feed.
  • Be sure to tighten up the cam’s lobe centerline angle (LCA) from whatever was optimum before by about 1 degree for every 16 cubic inches of capacity increase.
  • Increase valve lift at least the same proportion as the increase in displacement.
  • Make sure the induction system has enough flow capability to handle the extra cubic inches.
  • Try to keep the induction system cool as this makes more difference with a stoked engine.

We offer both Cast and Forged options. All rotating assemblies come with .030″ over bore pistons, unless otherwise indicated.If you require a different bore, please advise your sales representative. In addition, we offer Lightweight Pro Comp & Superlight assemblies.

All of the stroker kits from Bessel Motorsports include the following

  • Crankshaft
  • Connecting Rods
  • Pistons
  • Rings
  • Rod & Main Bearings


A typical complete stroker kit is comprised of the crankshaft, connecting rods, pistons, piston pins, main bearings, rod bearings, and piston rings. This assembly is also called “the rotating assembly” or “the bottom end”. Many different types of each of the components can be used for different applications. Crankshafts, for example, may be either of forged or of cast manufacture. Rods may consist of I-beam or H-beam rods made of various materials, from steel to titanium. Rods may be stock length (requiring the use of either shorter pistons, or taller cylinders), or shorter length (usually utilizing stock height pistons and cylinders).

Bessel Motorsports is dedicated to the serious street / strip racers and week-end warriors that are interested in purchasing a high performance stroker kits and racing parts for their race cars. Strokerkits.com has reached thousands of Street/Strip racers with reliable and reasonably priced stroker kits. For the hard core racer we also handle billet steel cranks, rods, and custom made pistons.

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