Fits: 807988A2, Mercruiser 4" exhaust riser / elbow (7 degree) for Mercruiser V6 and V8 engines. Sierra 18-1976-1
175-205 - V6, GM 229/262 CID (1983 - 0M SN#'s)
200-320, V8 (S.B.), GM 305/350/377 CID (1983 - 0M SN#'s)
330-370, V8 (B.B.), GM 454/502 CID (1981 & UP)