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1. 

   Joined: Jan 13, 2018
   Posts: 8

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   EdH

   What did I buy. I've never seen this casting number, and I use those words very loosely. No stamping on front pad, nothing above timing chain cover and only GM-DO with a wagon wheel in front. Anyone seen this before? Thinking some kind of crate engine. Thanks for any help.

    

   EdH, Aug 3, 2025 at 9:28 PM

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2. 

   Joined: Apr 28, 2006
   Posts: 3,607

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   badshifter

   Member

   from Chatsworth, CA

   I think that reads 6M-D
   More info needed. Rear main seal 1 or 2 piece? Pic of end of crank?

    

   badshifter, Aug 3, 2025 at 9:45 PM

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