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4.000" Bore, +.010 o/s.
Bump torque and horsepower on your 110" Twin Cam power train with the addition of high-compression pistons. Developed for the 110" Race Kit, these pistons increase the compression ratio to 10.5:1. Forged from high-strength aluminum, the pistons are precision-machined, and feature coated skirts for a tight-tolerance fit and quieter operation. All EFI models require ECM calibration* (priced separately). For race application only.
Note
Fits '07-later Twin Cam models equipped with 4.000" cylinders and Screamin Eagle MVA, CVO 110, ACR Performance or 110+ Cylinder heads. Does not fit Twin-Cooled models.
