Nick- The '67-'71 400 blocks are the best. They have the most meat in the main webs and supposedly had more nickel in the cast iron alloy. Even the '67-71 2-bolt main versions are stronger than the blocks made '75-79.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum.
White '67 LeMans 407/TH350/Ford 3.89... RIP
Red '67 LeMans. 407/TH400/Ford 3.25
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