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Big Block Heads ?

1075 Views 6 Replies 5 Participants Last post by  Johnny O
Could someone give me some info on these big block heads. 3964290/3964280 E 11 70 They are on a 454 in a car I just bought with receipts for $750. I know they were cast may 70 but just wanted the good,bad, or ugly. Thanx
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