Matching Numbers
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Matching Numbers
Hi all,
I recently bought a 77 F150 4x4. The guy I bought it from told me it had a 351M in it, but once I got it home and looked up the VIN I found that it oiginally came with a 400. I should point out that the fella I bought it from knew very litle about the truck, he had traded a boat for it and never really drove it. There has been work done to in the past, Edelbrock intake and Carb. I know that there really isn't any way to tell a 351M from a 400 with out checking he crank, but I was wondering if any of y'all knew how to find out if the engine is original to the truck? Thanks for any help.
I recently bought a 77 F150 4x4. The guy I bought it from told me it had a 351M in it, but once I got it home and looked up the VIN I found that it oiginally came with a 400. I should point out that the fella I bought it from knew very litle about the truck, he had traded a boat for it and never really drove it. There has been work done to in the past, Edelbrock intake and Carb. I know that there really isn't any way to tell a 351M from a 400 with out checking he crank, but I was wondering if any of y'all knew how to find out if the engine is original to the truck? Thanks for any help.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Post the VIN..decoding is simple. The 351M/400 engine is identical in appearance. 4th digit in VIN is engine size: H = 351M; S = 400.
Last edited by NumberDummy; Feb 16, 2007 at 06:10 AM.
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