Custom torque plates bored and honed HD cylinders to size comes with fitted WISECO FORGED PISTONS RINGS WRIST PINS /CLIPS. 3.937 BORE FINISHED TO MAKE THE 107 CID ON YOUR TWIN CAM FOR 96 AND 103 CID TWIN CAM HARLEYS OR ANY TWIN CAM WITH A 4.3/8 STROKE CRANK.