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don71 · 02-20-2008, 02:53 PM

I can't help much on the first long number you posted. Its a funny coincidence that it contains 455 AND 71, your build year.

Here is where to look for the engine casting number: and by the way, this IS a 455 casting number. A 350 will have 395558 as the casing number.

Its good news you found the tranny vin derivitive number and it matches

71-ow-4444 this number is the model year (1971) OW is the user division, in this case, oldsmobile. The last 4 digits is the calibration code, its deals with internal specifications set at the factory.

Click on this link and be sure to look at any attachment links for pics, this will help you with the vin on the engine. It will show you the link (location)for the vin derivitive. In your case, its should be something like ? 3M1144358? The letter M means Lansing Michigan, which your tranny code has and the original block "should" also.

http://classicoldsmobile.com/forums/...what-year.html

Oh, and welcome to the site

02-20-2008, 02:53 PM	#2 (permalink)
don71 feed the pig Join Date: Jun 2007 Location: Central Missouri Posts: 170	I can't help much on the first long number you posted. Its a funny coincidence that it contains 455 AND 71, your build year. Here is where to look for the engine casting number: and by the way, this IS a 455 casting number. A 350 will have 395558 as the casing number. Its good news you found the tranny vin derivitive number and it matches 71-ow-4444 this number is the model year (1971) OW is the user division, in this case, oldsmobile. The last 4 digits is the calibration code, its deals with internal specifications set at the factory. Click on this link and be sure to look at any attachment links for pics, this will help you with the vin on the engine. It will show you the link (location)for the vin derivitive. In your case, its should be something like ? 3M1144358? The letter M means Lansing Michigan, which your tranny code has and the original block "should" also. http://classicoldsmobile.com/forums/...what-year.html Oh, and welcome to the site __________________ 1971 Cutlass S 455/th400 3.23 rear---new interior allmost done. Last edited by don71 : 02-20-2008 at 03:04 PM. Reason: more info