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OLDSMOBILE BLOCK CASTING NUMBERS. Blocks 1949 - 1964 The casting number is located at the rear of the bell housing. The number are about ¾" high, and oriented to the right (passenger) side.
The cast-in ID consists of a letter or number, usually found in the depression just behind the thermostat's front right water passage and the #8 cylinder's runner. It is a 6 to 8 digit number, usually on one of the intake runners, often behind the carb, and usually near a raised CFD and star (dot with radiating lines).
Big Block Head ID/Codes, Casting Numbers. If it's an A, B, or C head, look for the engine unit number/ID code as detailed in the Blocks section under Big Block Unit Numbers. 1967 C heads had this number; 68-9's did not.
All you will see is a number cast into the part from 1 to 365. It will look like a plate with the date was screwed into the mold for the manifolds. Unlike Chevy, which uses actual dates (like 3 C 69, for March 3, 1969), Olds will cast 62 for the 62nd say of the year.
Oldsmobile blocks aren't made of mush, rather, they are made of high quality cast iron with plenty of nickel to make it strong. Olds big block engines were cast with extremely high nickel content until mid 1970. You can easily spot the difference in the shape of the "F" near the oil sending unit.
10 lip 2012 · I've spent the last several days compiling whatever I've been able to find on the early Oldsmobile V8s. Much of this information is a compilation of what I've found on the internet. Most of the contributors are DON_WOW, BlownOlds, Yorgatron, Blackrat40, C9, and Dennis Choinski. I'm sorry if I didn't include you, I forgot to.
29 lip 2003 · If it's an Olds engine, it's easy to identify by the oil filler spout that sticks up in front of the engine. Only Olds engines had this most excellent feature. Here's the casting numbers for Olds small bocks:
