Retains the same bore & stroke combination as the factory engine.
*Can have higher compression pistons, head work, etc when noted*
Retains the same stroke as the factory engine, but modifies the bore size for larger displacement.
*Can have larger throttle body, head work, etc when noted*
Fully modified engine builds with custom bore & stroke combinations for large displacement motors not available on a production motorcycle. *Can have higher compression pistons, head work, etc when noted*
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