Year: 1983 & Up; Serial: 1983 - 0M SN#’s; do not convert 0M into an ending year.; Joint: Wet Joint; Exhaust diameter (in): 4; Included gasket alternatives are selected for the installed cooling/carburetor/spacer configuration; not all gaskets are fitted simultaneously.; 1983 - 0M SN#’s; do not convert 0M into an ending year.