The info from the engine serial number (first number) decodes as:
4= Buick Division
0= 1970 model
H= Built in Flint, Mich. plant
24235= sequential build number from the VIN of the original car this engine was put in (one digit is missing, this section should be a 6-digit number)
The other number is the engine production code number and is also incomplete. It should read something like SF376, where the letters are the most useful characters for ID. Click on shop at the top of this screen and see the selection for Identify Your Buick Engine for more data.
Sometimes the characters of the stamped ID numbers disappear if the block has been decked during a rebuild.
About the only other thing that can be determined from the engine serial number is that the original car was not a Riviera. The Riviera sequential numbers started off with 900001. Other series started off with 100001.
The Electra would be the most likely source, based on usage of the 455. It could have come from a Wildcat, LeSabre, or Skylark as well.
What has been, can be again. (Bob Wills, 1942)
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