Before you build a Stroker

Typically, you do not need to clear your engine case for a stroker crankshaft as long as you keep your crank throw under 74mm. At 74mm, the crankshaft may or may not hit the engine case (depends on the parts used). At 76mm or larger, you will definitely need to clearance the engine case.
Since engines with larger crank strokes pull the connecting rod further out sideways you may need to replace the stock piston with a shorter piston (Stroker Piston) made to work with your new stroker crankshaft. At 74mm stock pistons will have to be clearanced. Even stroker pistons may still need to be clearanced.

Some piston manufactureres offer alternative piston kits, which are similar to stock pistons with the wrist pins position moved closer to the top. This allows the piston to move down further into the cylinder by changing the geometry at the connecting rod. In short, there is a lot of variance in stroker engine builds not limited to:
•Cutting the cylinders or running spacers.
•Clearancing the pistons.
•Clearancing the connecting rods.
•Longer connecting rods may be needed.




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