391 casting number location
#1
#2
This here might help:
http://www.erareplicas.com/427man/engine/partnums.htm
Date code:
Ford 352, 390, 406, 427 and 428 Engine Blocks
http://www.erareplicas.com/427man/engine/partnums.htm
Date code:
Ford 352, 390, 406, 427 and 428 Engine Blocks
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