OMC Stern Drives And Motors 1964-1986 Repair Manual., Page 510Get this manual
ENGINE BLOCK
Compression Ratio Bore and Stroke Compression Pressure PSI (Sea Level) Cranking Speed
Oil Pressure
302 CID 175 HP 1977-79
190 1977-79
351 CID 235 1977
351 CID 240 HP '78 250 HP '79
When checking compression, take the highest reading and compare it to the lowest readingThe lowest reading must be within 75 of the highest
Hot Rl 2000 RPM
Cylinder Desknation Starboard Bank Port Bank Firin? Order