what engine is it????
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From: illinois
what engine is it????
hi all...I have a question...I just recently got a 78 F-250 4x4 and since I have always been with chevy i'm a little confused...I was told it was a 400ci but the valve cover says 351m. Some people say it is the same difference...others say its 2 totally different engines. I was reading through some older threds and found out that the vin code "s" indicateds a 400...which is the code i have...my grandfather was the original owner of it so I know the engine is factory. Can anyone tell me if it is the same engine or how i can tell them apart.
Thanks, Josh
Thanks, Josh
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From: Louisville,Ky.
Must be a 400. The 351M and 400 are the same except for the stroke. The longer stroke of the 400 helps it produce more torque than the 351. Heads, intakes and all of the externals will interchange.
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My 77 150 has a 351M and the valve cover has both numbers on it. This article was very helpful in understanding the how to and what for about these motors.
http://www.fordtrucks.com/article/id...00_Engine.html
http://www.fordtrucks.com/article/id...00_Engine.html
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From: illinois
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It's true the 351M and 400 are the same engine except for the stroke; but won't the vin code tell which one was installed at the factory? I have a '79 supercab that I was told had a 400 in it, it even had a 400 sticker on the valve cover, I checked the vin code and it specified the 351M so I'm assuming it has the 351M, right?
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From: Oak Harbor, OH
Okay. Unless the valve covers were changed the 351M and 400 share the same vavle covers. The engine ID sticker on the drivers side one should read "351M/400" and then below it will either be 351 or 400 depending on what it is.
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Freshman User
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From: illinois
and while all of you knowledgeable people are here....what the hell is a highboy...and i was told this truck was a 3/4 ton with 1 ton suspenion...is this even possible?...he says he ordered it special that way???