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Discussion Starter #1 (Edited)
I was looking over the VIN on my 77 t-bird and found out it had a 400 in it, I bought it with a blown 351M. And by blown i mean busted. Why would you replace a 400 with a 351M. I replaced the Modified with another Modified and built it up nice and then I found this stuff out.
 

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Probably a former owner was trying to save a few bucks, or used what was available at the time, or couldn't tell them apart, as they are identical blocks and heads. Only difference is crankshaft stroke.
 
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