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Its got a 50 wow what the hell is that supposed to mean i dont speak metric for those of you who dont know oldsmobile manufactured 2 different versions of the 307 aka the 50 i love how . 1986 oldsmobile 307 specifications by henri bauholz the v8 30750 liters engine block for the 1986 oldsmobile is a 90 degree v8 engine the engine has a bore diameter of 3800 inches and a stroke of 3385 inches the compression ratio is 80 1 oil capacity is 5 quarts including the filter and oil pressure is 30 psi 1500 rpm. For every olds lover the biggest struggle with the engine isnt necessarily making power but keeping the engine intact the 307 like the 403 and other olds blocks uses an open main webbing . The comments are coming very close to being disabled. Oldsmobile engine decoder 1964 65 v6 buick engines the engine codes are found on the right hand cylinder head this code has a 2 letter prefix code followed by a 3 digit production code 1966 71 l6 chevrolet engine codes are found on the right side of the engine block just to the rear of the distributor