Description Model/Year Req'd Std Bore Size Sleeve Description Thickness O.D. Sleeve Length Install Type 200HP 3.0L 98-00 1999 185 C.I. Optimax 3.0L V6 Optimax 6 3.625" Straight sleeve with ports cut in No exhaust port relief notch 1/8" 3.692" 6.197" RS Installation Instructions