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I then had him check to see if it was a C/O....it didn't have cross bolted mains and it didn't have screw in freeze plugs either. So that eliminated the possibilities of a 427 C/O and a 406.
First of all not all co has screw in feeze plugs. Also not all 406's were cross bolted. Only late 406's were cross bolted. Lastly, there has even been a few 427's that weren't cross bolted. they however were iffigation motors
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