413 engine pad #s question

SGT FURY

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What do these engine numbers mean?

MR413
27478

Marine 1961 ?

IMG_0195.jpeg
 
No on both posts above. Not marine and not 1978. What is the block casting date on the side? It will be 1958/59 because the MR413 engine is a 1959 passenger car engine. Not just a 300 engine, they all have MR413 for 1959..

They don't know what the 5 digits mean.

eid
 
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