James Base and Curse Boards Kit, 3 3/4 "hole for Harley-Davidson

MLS butt joints (multicapa steel) of 0.050 ", final crushing of 0.042".
With cylinder-based o-based joints, it includes 2 cylinder head, 2 cylinder-based toric joints and o-return oil return joints for original diameter of 3-3/4 "as used in the TWIN CAM models of 88"/ 96 ".
Replacement reference 16775-99B BOARD OF CULATA, O-ROOM BOARD 11256 AND HEAD AND BASE KIT 17047-98.
MLS explained: MLS (MulticaPa Steel) is used in high -performance butt joint applications.
They consist of multiple layers of steel designed and riveted in a unique way, outside the joint. Surface to facilitate installation and provides a high performance stamp.

Compatible with:> 99-17 88 "/96" Twin Cam (except Twin Cooled)