S&S, TWIN CAM 3-7/8" BIG BORE CYLINDER SET. SILVER
3-7/8" (3.875") big bore cylinders, without pistons, with a stock length of 4.937" and compatible with the stock 4" stroke of 88" Twin Cams and 4-3/8" stroke of 96" Twin Cams. Crankcase machining is not required for installation. Brings 99-06 Twin Cam to 95" and 06-17 96" Twin Cam to 103". Note: Cylinders must be finish bored and honed to fit stock size pistons. The advantage is that this will enable you to bore the cylinders loose, for direct racing, or tight for a quiet engine with maximum longevity. Big bore conversion pistons are sold separately.

Fits: > 99-06 88" Twin Cam to 95" and 06-17 96" to 103" Twin Cam