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Old May 23rd, 2007, 12:12 PM   #4
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The 400/351M is a big block, it is a 351bigblock with 400 heads on it. It was used in Full size pickups and broncos in the late 70's to early 80's. It was discountinued and replaced the the 5.8L 351 small block because the 351M was found to be unreliable and constantly having problems.
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