Stroker Kits

Want more displacement from your engine without changing the block? A stroker kit replaces the crankshaft with a longer-stroke version and typically comes with matched connecting rods and, in some cases, pistons. This category is for you if you are building an engine project focused on torque and power.

What a stroker kit does

A stroker kit increases displacement by giving the piston a longer travel in the cylinder. This can deliver more torque, but the gain depends on the cylinder head, intake, boost pressure and engine management. We carry kits from Brian Crower for e.g. Honda K20, Mitsubishi 4B11T, Nissan VQ37DE and Chevy LS1, as well as for UTVs such as Can-am X3 and Polaris Pro R.

How to choose a stroker kit

• Stroke and bore: the stroke length is stated in the product name, e.g. 92 or 98 mm, and some kits let you choose bore and compression.
• Connecting rods: kits are available with different rod series, e.g. Pro625+, ProH2K or Carrillo. Choose based on power goals, RPM and boost pressure.
• Pistons: some kits include pistons, others only the crankshaft and rods, so check piston height and compression for the new stroke.
• Balancing: kits marked “Unbalanced” must be balanced before the engine is assembled.

Installation and other parts

Installation requires disassembling the engine and precisely measuring bearing clearance and piston height, so the work should be carried out by an experienced engine shop. It is a good idea to replace bearings, rings and gaskets at the same time with a set from engine rebuild kits. If your engine has balance shafts, balance shaft kits may also be relevant. You will find more parts for the rotating assembly under engine kits and rotating assemblies.

Frequently asked questions

What is the difference between a stroker kit and an engine rebuild kit?

A stroker kit changes the engine's geometry with a longer-stroke crankshaft and matched connecting rods, increasing displacement. A rebuild kit typically contains wear parts such as bearings, rings and gaskets and retains the engine's original dimensions.

Does a stroker kit need to be balanced before installation?

It depends on the kit. If the product name says “Unbalanced”, it is supplied unbalanced, and the crankshaft, connecting rods and pistons should be balanced together by an engine shop before the engine is assembled.

Does a larger displacement affect inspection and registration?

It can. A change in displacement can affect the car's approval and registration, and the requirements depend on the car and the extent of the modification. Check the rules for your specific car with an inspection authority before starting the project.