Occassion. Mercruiser Repair serive manual outline 1975/1976. Models with "GM" ENGINE BLOCK; Model 120 Serial No. All, Model140 Serial No. All, Model 165 Serial No. All, Model 255 Serial No. 4175500 and Above, Model 280 Serial No. All, Model 350 Serial No. All, Model 400 Jet, Serial No. All. Models wirh "FORD" ENGINE BLOCK; Model 888 SerialNo, All, MNodel 225 Sreial No. All, Model 225-S Serial No. All, Model 233 Serial No. All, Model 255 Serial No. 4175499 and Below. Models with "MERCRUISER" BLOCKS; Model 470 Serial No. All.